And on the same theme , at this URI, http://www.biology.clc.uc.edu/steincarter/moon/Moon%20Code.htm
And while the site exists - some of the above code and images were from here :-
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And similar information, calculated a similar way ... with differences ... . |
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This is from http://www.netacc.net/~poulsen/moonphase.html , and his warning below ... Why might these dates be different from those provided by the US Naval Observatory? I'm performing a very simple counting trick to determine the phase of the moon. I start with a known date of the new moon. Then, I count the number of synodic periods that have happened since then. From the whole and fractional periods counted, I can determine where within the phase cycle we currently are and when the next new or full moon will occur. However, such a technique is 100% accurate only if the Moon's period is constant. It's not. It varies a bit, sometimes taking a bit more or less than 29.53058867 days to go from phase-to-phase. Thus, in some months, my script will calculate phases earlier or later than they will truly occur. The error can be as much as 24 hours off! |
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And on the same theme , at this URI, http://www.biology.clc.uc.edu/steincarter/moon/Moon%20Code.htm And while the site exists - some of the above code and images were from here :-
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New Moon - The Moon's side facing the Earth is un-illuminated. The Moon is not visible (except during a solar eclipse). |
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Waxing Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing. |
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First Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing. |
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Waxing Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing. |
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Full Moon - The Moon's illuminated side is facing the Earth. The Moon appears to be completely illuminated by direct sunlight. |
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Waning Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing. |
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Last Quarter - One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing. |
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Waning Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing. |
Local copies of the images from Steincarter :-
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Other moon images ...
