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10y ago

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Continue Learning about Astronomy

Why must the astrolabe be lined up with north?

The astrolabe needs to be lined up with north so that the user can accurately measure the altitude of a celestial object. By aligning the astrolabe with north, the user can ensure that the measurements taken are correctly referenced against the horizon and celestial coordinates.


What type of eclipse occurs when the earth moon and sun are lined up an order?

When the Earth, Moon, and Sun are aligned in that order, a lunar eclipse occurs. During a lunar eclipse, the Earth casts its shadow on the Moon, causing the Moon to appear darkened or take on a reddish hue. This alignment typically happens during a full moon, when the Moon is directly opposite the Sun in the sky.


Why isn't there a lunar eclipse every time we have a full moon?

The orbit of the Moon is not in the same plane as the plane of Earth's orbit around the Sun. So the Moon is only seldom lined up directly behind the Earth from the Sun. However, because of the larger size of the Earth, lunar eclipses are more frequent than solar eclipses, occurring at least twice a year (either total or partial).


What will happen if all the planets were lined up in a straight line?

the Mayan calendar predicts this on Dec 22, 2012 - end of times. I predict nothing much will happen.


Why do lunar eclipse only occur when the moon and the sun are opposite from the sun?

The Sun shines on the Earth and Moon, and each cast a shadow straight out into space. When the Moon goes into the Earth's shadow - when the Sun, Earth and Moon are lined up exactly - we have a lunar eclipse.