Sky Watch is your astronomical alarm clock that will keep you informed about what's going on in the sky. You may have purchased or built the finest telescope with the best optics, but you won't be able to make the most of it without accurate and up to date astronomy news on what is going on in the sky nightly at your location. Even the best magazines such as Sky & Telescope or mailing lists can only provide general information. There are computer programs and web sites that will may help but you have to check them regularly. For less than the cost of a decent eyepiece, SkyWatch will provide daily updates on eclipses, satellite passes, meteor showers for your specific location.

Moon eclipses occur very infrequently due to the Moon's 5 degree orbital tilt out from ecliptic. Because of this orbital tilt, new Moon's and full Moon's usually occur when the Moon is either above or below the Earth's orbital plane. The Moon's orbital intersects the ecliptic and this forms a line called called the 'line of nodes.' When the Moon, Earth and Sun are all lined-up on this line of nodes we have conditions mandated for an eclipse.

Astronomers have calculated the number of times new moon's takes place on the line nodes and have determined that there are at least 2 and no more than five solar eclipses yearly. The last time there were 5 solar eclipses in a single year was in 1935. Lunar eclipses occur about as frequently as solar eclipses but maximum number of eclipses in a given year possible is only seven.

Even though solar and lunar eclipses occur with comparable frequency, it is still far more common-place to experience a moon eclipse. That’s because the darkened full Moon can be seen from anywhere on the night half of the Earth during moon eclipse. To see a total solar eclipse, you have to be in the exact path of totality. This path, sometimes up to 200 miles wide, never covers more than roughly one-half of one percent of the Earth's surface and often traverses open seas or remote regions of the planet. With fewer than 70 total eclipses per century, opportunity to view one is for most of us a once-in-a-lifetime occurrence.

AZeMOON finds it quite amazing total solar eclipses even occur at all. They are possible because the Sun and Moon appear from Earth to be approximately the same size in the sky. The Sun and Moon each appear to be about .5 degrees in angular size. The Sun, whose diameter is really 400 times the Moons' by comincidence also happens to be about 400 times as far away from the Earth. This condition permits the Moon to just barely cover up the Sun. In fact, if the Moon's diameter (2,160 miles) were just 140 miles less, it would not be large enough to ever completely cover the Sun so a total solar eclipse could never happen anywhere on Earth.

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