Rotation and Revolution

• mean solar day → takes the sun 24 hrs to complete the cycle

• rotation → earth ikot-ikot on its axis

  • sidereal day → complete rotation of the Earth on its axis, only 23 hrs and 56 mins
  • This is four minutes before the sun reach its noon position.

• revolution → the earth make rounds around the sun

  

As the Earth rotates on its axis, it revolves around the sun.

• nicolaus copernicus → basta alam mo na

• distance between the earth and sun → 150 million km / one astronomical unit (AU)

• perihelion (Jan 4) → earth is closest, 147 mill km

• aphelion (July 4) → earth is farthest, 152 mill km

Star Trails

• Polaris - north star

Zodiacs

• The sun follows the path along certain constellations - the zodiacs.
• This set of constellations serves as the address of the sun in the course of a year.
• if zodiac is not visible → that's the current position of the sun

The Seasons

• brought about by the revolution of the Earth.
  • the tilt of the Earth’s axis also plays a part in the changing of seasons.