Astronomical Phenomena

• Constellation - The earliest astronomers divided the night sky into

  groups of stars called constellations. The names of

  the constellations are mainly a carryover from the

  names assigned by early Greek, Babylonian and

  Egyptian astronomers.
• Stellarium - is a planetarium software that shows exactly what you see when you look up at the stars.
• Gnomon - primitive version of sundial

  
• Moon - A natural object that orbits a larger object.
• moon - also called a satellite, is a relatively small

  object that is orbiting around a planet.
• Sidereal Month – moon takes a full orbit in the Earth for 27

  days, 7 hours, and 43 minutes.
• DIURNAL MOTION -is the apparent daily revolution of the celestial sphere around the celestial poles as a direct effect of the Earth’s rotation on its axis.
• ANNUAL MOTION - is the apparent yearly movement of the stars as

  observed from Earth as a direct effect of the Earth’s revolution around the sun.
• Lunar Eclipse - occur twice every year, happens during full moon
• Solar eclipse - Occur twice in every 3 years, happens during new moon
• Mercury - the smallest and the fastest of our neighbors, is somewhat larger than the moon and similar in appearance. It is the planet closest to the sun.
• Venus - is the brightest object in the

  sky, and even visible in daylight.
• Mars - the reddish planet, is the only other known body whose surface conditions seemed suitable for life of some kind.
• Jupiter is the most massive planet in our solar system, with four planet-sized moons and many smaller moons
• Saturn - is one of the most remarkable objects in the sky, it has some 23 moon in ring, and titan is the largest, 1.6 times larger than the moon in earth
• Synodic Month - it takes our Moon about 29.5 days to

  complete one cycle of phases (from full Moon to full

  Moon) averages about 29.53 days.