At the autumnal equinox (Sept 22, 2008; 11:44:18 A.M. EDT), the Sun appears to cross the celestial equator, from north to south; this marks the beginning of autumn in the Northern Hemisphere.

It's one of two times a year when the Sun crosses the equator, and the day and night are of approximately equal length.

It is a good day to replace a new can for exposing for three months until the winter solstice. If you wish to have the expsoure of 6 months and you have started exposure from June to December you can leave your pinhole can alone until December.

Stephen Pickering sent me a solargraph. It was made with a home made pinhole camera and 8" x 10" paper. The location is 50.7N, 4.5E (just south of Brussels) and the viewing direction is towards the rising sun in the East for the period 20 July to 14 September 2008 .

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