Latitudes and longitudes and india size and locationRajesh Kumar
This presentation covers the following topics:
1. Geographic coordinate system, i.e, latitude and longitudes
2. Size and location of India
(because before understanding the size and location our country, Geographic coordinate system, i.e, latitude and longitudes are important)
which enables the students to locate all four hemispheres including
Northern Hemisphere
Southern Hemisphere
Eastern Hemisphere
Western Hemisphere
Students will be able to identify which line divides the earth into the correct hemispheres.
Students will be able to find locations on map using longitude and latitude.
Grade 8 Integrated Science Chapter 12 Lesson 1 on the view of space from Earth. This lesson gives a short introduction on constellations, relative brightness, luminosity, and the apparent size of a star.
5. Finding your way home How do you travel in a straight line? Latitude hook Must be calibrated to a specific location Polaris above the loop, head south Polaris below the loop, head north Kamal Why does this work?
7. Determining Latitude Accurate to within 1 Degree 1 degree of latitude = 60 minutes 1 minute = 1 nautical mile Polaris is 430 light years away 2.5 X 1015 miles If surveyors were as accurate as Polaris - 0.0000000002 inches If Polaris was as accurate as a surveyors - 4,000,000,000 miles
8. Latitude is θ Cross staff Quadrant Astrolabe Octant Sextant
9. Longitude The X-Prize of the millennium No accurate method until 19th century 3 puzzle pieces Rotation of the earth = 15o per hour Time the sun peaks at prime meridian = 1200 Time (GMT) the sun peaks at your location
10. Relative Longitude Not very accurate! Find a star near the eastern or western horizon Measure the altitude of that star at the same time every night Changes in degrees correspond to movement east or west 2 Caveats Need to correct for latitude Need to know what time it is
11. What time is it? The sky is a clock, too Mariner’s Nocturnal Measures the angle between Polaris and Ursa Major or Ursa Minor
Step 1 – figure out what hemisphere you’re inPlenty of ocean to get lost in
Celestial pole – lucky if you’re in the north, polaris is at the poleLearn your landmarks – the two bears in the north, the southern cross in the southFind the southern pole by drawing a line from acrux and the tip of the cross and between agena and rigelcentaurus, lines intersect at the southern celestial pole