NATS 1570 – Questions and Answers Rated A

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NATS 1570 – Questions and Answers Rated A What causes the seasons on Earth? ✔✔The tilt of Earth's axis (23.5 degrees) from it's orbital axis True or False. The Moon is not lit up by the Sun at all times, which is why we see a New Moon. ✔✔False. Half of the surface of the Moon is always lit up by the Sun. We only see variations of illumination from Earth. What direction does the Moon orbit the Earth? ✔✔Counter-clockwise Why is the ecliptic tilted from the celestial equator? ✔✔Because the Earth doesn't spin on the same axis as the Sun. The two axes are tilted from each other. When is summer solstice? ✔✔It's when the Northern hemisphere is tilted the most TOWARDS the Sun. Near June 21st When is winter solstice? ✔✔It's when the Northern hemisphere is tilted the most AWAY from the Sun. Near Dec 21st True or False. The distance between the Earth and Sun does affects the seasons. ✔✔FALSE. The seasons are caused by Earth's tilt. What would happen to the seasons if the Earth was only tilted 5 degrees? ✔✔The seasons would be less extreme due to less variation in day length and direct sunlight. Lunar eclipses only occur at the ________ Moon. ✔✔Full Solar eclipses only occur at the ________ Moon. ✔✔New Why don't we have eclipses every month? ✔✔Because the Moon's orbit is tilted 5 degrees from the plane of the ecliptic. So, the Sun and Moon don't travel exactly on the same path/plane. What happens to Earth's axis when a full precession cycle occurs? ✔✔Celestial poles change What is the cause of the lunar phases? ✔✔The changing angles of the Earth, Moon and Sun as the Moon orbits the Earth. How does the Moon rotate and revolve around the Earth? ✔✔Synchronous rotation What is synchronous rotation? ✔✔It's when the Moon (or any object) rotates on its axis in exactly the same time that it takes to revolve around Earth (or any other object). Why is the Moon always faced the same way towards the Earth? ✔✔Synchronous rotation Why does the Moon appear different from one night to the next? ✔✔It's because of the changing illumination by the Sun. It has nothing to do with the Moon's rotation. Why are lunar eclipses more common than solar eclipses? ✔✔They are not. Lunar and solar eclipses occur with equal frequency. Lunar eclipses are more widely visible because Earth casts a much larger shadow on the Moon during eclipses (earth is much larger in size). Also, lunar eclipses can be seen from the entire night side. What causes tides? ✔✔Differential gravity from the Moon Spring Tides ✔✔A tide just after a New or Full moon. The greates difference between high and low tides because there is a combined pull from the Sun and Moon. What is the Moon's phase period? ✔✔29.5 days What is the Moon's orbital period/side real month? ✔✔27.25 days Neap Tides ✔✔A tide just after first or third quarters of the Moon. The least difference between high and low tides because there is less pull from the Moon only.

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