Earth
Causes night and day
Rotation of the Earth
Happens when the moon falls under the Earth's shadow
Lunar eclipse
Occurs when the Moon come in between the Sun and the Earth, blocking some of the Sun's light and casting a shadow on the Earth
Solar eclipse
Closest to the sun
Mercury
Used to observe stars & other celestial objects
Telescope
Causes different seasons at different parts of the Earth
Earth's tilt on its axis as it moves around the Sun
Effect of the moon's gravitation on the seas and oceans on Earth
Tides
Distance of the sun from the Earth
15 million km or 8 light minutes or 1 Astronomical unit
Planet with the most number of moons
Jupiter
2 naturally occurring celestial objects in the solar system other than planets
71% of the surface is covered by this
Water
Time taken for 1 complete 1 rotation around the Earth
Approximately 27 days/1 month
Where can you observe the sun for 24 continuous hours
2 moons of Mars
Phobos and Deimos
2 belts in the solar system
Asteroid & Kuiper belt
2 types of gases in the atmosphere
Any 2: oxygen, carbon dioxide, nitrogen, argon, water vapour
Time taken for 1 complete rotation around its axis
Approximately 27 days/1 month
2 things that occur during summer soltice
Any 2:
Maximum tilt of the Earth poles toward the sun
Longest day/ shortest night
2 planets with rings
Saturn & Uranus
2 uses of satellites
Any 2: Navigation/positioning systems (GPS and GNSS), communication, Earth-observation satellites (EOS)
3 different calendar systems
Any 3: Julian calendar, Gregorian calendar, Islamic calendar, Chinese calendar, Javanese calendar, Hebrew calendar
3 phases of the moon
Any 3: Full moon, new moon, waxing crescent, waning crescent, waxing gibbous, waning gibbous, 1st or 3rd quarter moon
Heliocentric and geocentric
versus a system with the Earth as the center of the universe and everything else revolving around it
Source for the name of planets
Roman mythology/Roman Gods
Geosynchronous orbit
Same orbital period as the Earth's rotation