The document discusses the Earth's rotation and revolution around the Sun. It explains that the Earth's true solar day, from true noon to true noon, varies throughout the year due to changes in the Earth's orbit and axial tilt. During some periods, the true solar day is up to 30 seconds longer than the average solar day, while during other periods it can be up to 21 seconds shorter. The document also provides a brief overview of the four seasons experienced on Earth as it revolves around the Sun - spring, summer, autumn, and winter.

1. The Earth and Its Motion

2. Bawal matulog kapag nanonoood

3. Rotation of The Earth

4. Earth's rotation period relative to the Sun (true noon to true noon) is its true solar day or apparent
solar day. It depends on the Earth's orbital motion and is thus affected by changes in
the eccentricity and inclination of Earth's orbit. Both vary over thousands of years so the annual
variation of the true solar day also varies. Generally, it is longer than the mean solar day during two
periods of the year and shorter during another two.[n 1] The true solar day tends to be longer
near perihelion when the Sun apparently moves along the ecliptic through a greater angle than
usual, taking about 10 seconds longer to do so. Conversely, it is about 10 seconds shorter
near aphelion. It is about 20 seconds longer near a solstice when the projection of the Sun's
apparent movement along the ecliptic onto the celestial equator causes the Sun to move through a
greater angle than usual. Conversely, near an equinox the projection onto the equator is shorter by
about 20 seconds. Currently, the perihelion and solstice effects combine to lengthen the true solar
day near December 22 by 30 mean solar seconds, but the solstice effect is partially cancelled by the
aphelion effect near June 19 when it is only 13 seconds longer. The effects of the equinoxes shorten
it near March 26 and September 16 by 18 seconds and 21 seconds, respectively.[1][2][3]

5. Revolution of The Earth

6. Throughout the year, as our small blue planet orbits the Sun,
many parts of the Earth experience changing seasons. The warm
Spring brings new flowers, and young animals. This is followed
by a hot Summer, filled with vacations, hikes, and outdoor
swimming. Following Summer is another warm season known as
Autumn, where leaves turn beautiful shades of reds and browns
before falling off of their trees. Finally after all of these warmer
seasons comes one that is cold, wet, and dry, known as Winter.

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