Friday, January 03, 2014

3% Moon and Venus

Every hobbyist has their goals. Some birders keep life-lists of the birds they've seen. Sky divers test to see how accurate they can be on where they land. People who bike have special treks or trails they want to pedal. One of the goals for an observational astronomer is to see the youngest possible moon. New moon happens every 29 1/2 days and is when the moon and sun are in conjunction. The moon is invisible to us then but gradually it climbs away from the sun, appearing as a thin crescent. How thin a crescent you can find depends on if the moon is at perigee, it's ecliptic latitude, azimuth, and how clear the sky is. This picture is taken when the moon is 37 1/2 hours old. Nowhere near the youngest ever seen but still very pretty. See if you can locate Venus among the tree limbs.

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