This document discusses the origins and definitions of various units of time measurement. It provides the following key points:
- Years, days, and months are based on the motions of the Earth, sun, and moon. A day is one rotation of the Earth, a year is one revolution around the sun, and a month was originally one revolution of the moon.
- Solar days vary slightly in length due to the elliptical orbits of planets and Earth's axial tilt. Local mean time uses longitude to account for time differences between locations.
- Astronomy uses precise time measurements like Greenwich Hour Angle and Local Hour Angle to determine positions of celestial bodies based on their movement relative to meridians. The Local Hour Angle
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
The International Date Line (IDL) is an imaginary line of demarcation on the surface of the Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
A description of solar radiation and how it is measured using pyranometers and other instruments, with a challenge for future makers. These measurements are needed for solar energy applications from electricity to solar cooking for refugees. A new ISO standard now provides a way to make fair comparisons of solar cookers. This method uses solar irradiance measurements to standardize the data for use anywhere in the world.
the presentation is about Field Astronomy, generally deals with astronomical terms & Co-ordinate system related to field astronomy. Astronomical terms like celestial sphere, Zenith, Nadir & Celestial pole/ equators all are included in these slides; rather than that Celestial latitude & longitude co-ordinate system, Altitude & azimuth co-ordinate system, declination & Right ascension co-ordinate system & Declination & hour angle co-ordinate system are explained in these slides.
The Sky
Astronomy is about us. As we learn about astronomy, we learn about ourselves. We search for an answer to the question “What are we?” The quick answer is that we are thinking creatures living on a planet that circles a star we call the sun. In this chapter, we begin trying to understand that answer. What does it mean to live on a planet?
The preceding chapter gave us a quick overview of the universe, and chapters later in the book will discuss the details. This chapter and the next help us understand what the universe looks like seen from the surface of our spinning planet.
But appearances are deceiving. We will see in Chapter 4 how difficult it has been for humanity to understand what we see in the #sky every day. In fact, we will discover that modern science was born when people tried to understand the appearance of the sky.
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
The International Date Line (IDL) is an imaginary line of demarcation on the surface of the Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
A description of solar radiation and how it is measured using pyranometers and other instruments, with a challenge for future makers. These measurements are needed for solar energy applications from electricity to solar cooking for refugees. A new ISO standard now provides a way to make fair comparisons of solar cookers. This method uses solar irradiance measurements to standardize the data for use anywhere in the world.
the presentation is about Field Astronomy, generally deals with astronomical terms & Co-ordinate system related to field astronomy. Astronomical terms like celestial sphere, Zenith, Nadir & Celestial pole/ equators all are included in these slides; rather than that Celestial latitude & longitude co-ordinate system, Altitude & azimuth co-ordinate system, declination & Right ascension co-ordinate system & Declination & hour angle co-ordinate system are explained in these slides.
The Sky
Astronomy is about us. As we learn about astronomy, we learn about ourselves. We search for an answer to the question “What are we?” The quick answer is that we are thinking creatures living on a planet that circles a star we call the sun. In this chapter, we begin trying to understand that answer. What does it mean to live on a planet?
The preceding chapter gave us a quick overview of the universe, and chapters later in the book will discuss the details. This chapter and the next help us understand what the universe looks like seen from the surface of our spinning planet.
But appearances are deceiving. We will see in Chapter 4 how difficult it has been for humanity to understand what we see in the #sky every day. In fact, we will discover that modern science was born when people tried to understand the appearance of the sky.
Geodetic Astronomy - MOTION IN THE HEAVENS - EARTH, SUN AND STARSAhmed Nassar
Geodetic Astronomy
MOTION IN THE HEAVENS
EARTH, SUN AND STARS
Motion of Earth
Earth’s Rotation
Earth’s Revolution
Motion of Sun
Equinoxes
Solstices
Motion of Stars
Proper Motion
Transverse Velocity
Radial Velocity
The geographic coordinate system is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
2. Grunt Productions 2007
Origins of TimeOrigins of Time
• Apparent motion of the Sun around theApparent motion of the Sun around the
Ecliptic takes one year.Ecliptic takes one year.
• One rotation of the Earth on its axisOne rotation of the Earth on its axis
(measured relative to the Sun) takes one(measured relative to the Sun) takes one
solar day.solar day.
• Period of the Moon’s revolution round thePeriod of the Moon’s revolution round the
earth was one month (now arbitrary period).earth was one month (now arbitrary period).
• A week is the length of time for the Moon toA week is the length of time for the Moon to
progress from one phase to the next.progress from one phase to the next.
3. Grunt Productions 2007
Solar DaySolar Day
• Interval elapsed between twoInterval elapsed between two
successive transits of the Sun acrosssuccessive transits of the Sun across
the same meridianthe same meridian
• Apparent solar day is not a fixed length:Apparent solar day is not a fixed length:
– orbits of planets are ellipsesorbits of planets are ellipses
– the radius vector sweeps out equal areasthe radius vector sweeps out equal areas
in equal periods of timein equal periods of time
– time is measured around the plane of thetime is measured around the plane of the
equator (inclined at 23equator (inclined at 2311
//22
oo
to ecliptic)to ecliptic)
5. Grunt Productions 2007
Local Mean TimeLocal Mean Time
• System based solely on longitude.System based solely on longitude.
• Based on earth’s rotation of 15Based on earth’s rotation of 15oo
per hour.per hour.
• Four minute time difference for everyFour minute time difference for every
degree in longitude.degree in longitude.
• Impractical for normal time keeping butImpractical for normal time keeping but
used in astronomics to measure positionsused in astronomics to measure positions
relative to the Observer’s Meridian.relative to the Observer’s Meridian.
6. Grunt Productions 2007
Action of SundialAction of Sundial
GreenwichObserver’s
Longitude
Sun Dial
Sun
Ante meridian
Sun’s Apparent
Movement
7. Grunt Productions 2007
Use of Time in AstroUse of Time in Astro
• NA lists the position of all heavenly bodiesNA lists the position of all heavenly bodies
in terms of hour angle and declination.in terms of hour angle and declination.
• Greenwich Hour Angle (GHA) is increasingGreenwich Hour Angle (GHA) is increasing
at a rate of 0.25 min of arc per second.at a rate of 0.25 min of arc per second.
• Hour angle relative to our position isHour angle relative to our position is
referred to as the Local Hour Angle (LHA).referred to as the Local Hour Angle (LHA).
• LHA is found from GHA plus longitudeLHA is found from GHA plus longitude
East or minus longitude West.East or minus longitude West.
8. Grunt Productions 2007
The Local Hour AngleThe Local Hour Angle
Local Hour Angle
Pole
Meridian
of Star
Equator
Observer’s
Meridian
9. Grunt Productions 2007
Hour AnglesHour Angles
Earth
Rotation Greenwich
Meridian
Apparent
Rotation
Westward
Greenwich
Hour Angle
(GHA)
Observer’s
Meridian
Longitude
West
Local Hour Angle
(LHA)
10. Grunt Productions 2007
Longitude EastLongitude East
Greenwich
Meridian
Greenwich
Hour Angle
(GHA)
Observer’s
Meridian
Longitude
East
Local Hour Angle
(LHA)
11. Grunt Productions 2007
Calculating LHACalculating LHA
• Universal Time (GMT) must be used.Universal Time (GMT) must be used.
• Obtain hourly prediction of GHA from theObtain hourly prediction of GHA from the
Nautical Almanac.Nautical Almanac.
• Obtain increment in hour angle based onObtain increment in hour angle based on
minutes past the hour (buff pages of NA).minutes past the hour (buff pages of NA).
• Apply correction for DR longitude subtracting forApply correction for DR longitude subtracting for
W and adding for E.W and adding for E.
• N.B. 360N.B. 360oo
can be added or subtracted at anycan be added or subtracted at any
time.time.
Time may seem a strange subject to pick out when investigating astro-navigation, but time is a fundamental element in fixing the position of any heavenly body.
Time and the astronomical features which go with it form a vital element in our daily lives.
The main elements of our measurement in time are drawn directly from astronomical events. Because technology has allowed us to define time with great precision, we no longer link time and these events directly. In fact, the second has been defined so precisely that the variations in the earth’s rotation, it is slowing down, have to be compensated from time to time by a leap second, noted by the extra blip on the Greenwich Time Signal.
Even the solar day has to be calculated using a theoretical sun, because the real sun does not move at a constant relative rate.
The variations in the relative motion of the sun are caused because:
a. the earth’s solar orbit is elliptical.
b. orbiting bodies behave in accordance with Kepler’s Law and so the speed of the earth’s motion around its orbit varies at different times of the year.
The most practical result of these factors is that the time of the sun’s meridian passage at Greenwich varies by up to 16 minutes ahead or behind midday.
The times of meridian passage are given daily in the NA.
Until the industrial revolution, time differed from one town to another. The time of midday could be measured (if the sun was out) and the day centred around this event. The terms am and pm are still used today.
If the earth rotates 360° in 24 hours, this can be broken down to a rate of 15° per hour or 4 minutes in time per degree of longitude.
In local time, Plymouth would be approximately 20 minutes behind London because the difference in longitude is about 5 degrees.
This is impractical for normal time keeping and time zones were introduced so that the same time would be kept in different places. The first company to use zone time was the GWR for their timetable.
As already stated, all times in the Nautical Almanac are related to Greenwich and UT (GMT).
The relative positions of heavenly bodies would be just the same if we were situated at another longitude, provided we amend the time at which we make our observation.
Although we use our longitude and the GHA of a body, the relative position is found by combining these to work out the difference, called the local hour angle (LHA).
LHA is equal to GHA minus longitude west or GHA plus longitude east.
Finally, a quick look at the relative motion of the moon illustrates the relative nature of astronomical observation. Although the moon completes its orbit of the earth in just over 27 days, when viewed from the earth, which is of course moving along its solar orbit, the event appears to take 29.5 days, the period of the lunar month.
The final diagram shows the phases of the moon, created as the moon changes position relative to the sun.