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Moon's and Sun's diameter comparison
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1024 x 768 pixels (128 ko)

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This composite illustrate the reason why some Sun eclipses are annular : even if the Sun's and Moon's diameter seem to be equal (about 1/2 degree), it's not exactly the same. The Sun and the Moon are more or less big, depending on their distance from the Earth. Often, the Moon is bigger than the Sun: a total solar eclipse occurs. Sometimes, the Sun is bigger dans an annular eclipse occurs.
Remember that those kinds of eclipse occur when the Moon is New, so almost invisible. Conveniently, I choose to take a picture of the Moon (24 hours before the Full Moon) and the Sun on the same day.
Let's note that I speak about apparent diameter, i.e. the diameter of thoses objects in the sky.
Seen 17953 times
Instrument   110 mm focal length, composite of 2 pictures
Exposure & film   1/125 & 1/500 s with digital camera Camedia 5060 + DCL-4337 + 80/480 refrector
Date & place   February 22, 2005, Quimper

 The others pictures of "Sun"
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |

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