When the moon is very nearly on-line between the centers of the Sun and Earth.
(That will also be the time of 'New Moon'.)
No, solar eclipses can be years apart.
Five is the theoretical maximum number of solar eclipses in one calendar year; generally 4 partial eclipses and one total or annular eclipse. This configuration happens about every 200 years or so. Interestingly, there will be four solar eclipses in 2011; all will be partial eclipses, visible (if at all) only from polar regions. The last time there were five solar eclipses in a year was in 1935; the next time will be in 2206.
About one or two solar eclipses per year, and one or two lunar (Moon) eclipses per year, on average. Go to NASA.com and search it. there will be a map with the spots of eclipses and time/year.
Lunar eclipses can be observed only during the night and only when the moon is far from the sun. Solar eclipses can be observed only during the day and only when the moon is near the sun. This question can be answered with a search engine. Try it next time: http://www.google.com/search?q=Does+a+Lunar+Eclipse+happen+at+day+time%3F
It is a new Moon. For a solar eclipse, the moon has to be between Earth and the Sun. We get a total lunar eclipse when Earth is between the Sun and the Moon. The Moon would have to be full for it to be eclipsed.
Solar eclipses occur when the moon moves in front of the sun, causing the suns light to be temporarily blocked. Since the sun is only visible from the Earth's surface during the day, this is the only time that a solar eclipse can occur.
a long time ago
No. For one thing, the moon revolves around, earth, not the sun.
No. Lunar eclipses affect the entire night half of the Earth, and happen every year or so. Solar eclipses cover only a tiny swath of the Earth's surface, but given enough time, every point on Earth would be affected.
The new moon is the monthly phase of the moon where it is completely unlit (or as near to being completely unlit as possible that month). If you think about it, this is going to happen when the moon is between the earth and the sun. New moon happens when it is as close as it can be to casting a shadow on the earth. The moon doesn't cast a shadow on the earth every month, because of the relationship of the orbits of earth and moon. Every now and then, the moon does cast a shadow on the earth at the time of new moon. When this happens, the moon is eclipsing the sun. There are several kinds of solar eclipse, and few things are as beautiful or as awesome as a total solar eclipse.
A solar eclipse is possible only at the time of New Moon.It never occurs during Full Moon.
In a solar eclipse, the shadow of the Moon hits the Earth. This can only happen when the Moon is directly, almost perfectly, between the Sun and the Earth. So solar eclipses can only happen at the new moon phase.