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Stellar Neophyte

Reader Question About Moon Phase

19 Nov 2016, 17:00 UTC
Reader Question About Moon Phase
(200 words excerpt, click title or image to see full post)

I'm trying not to let the term 'reader question' inflate my ego, but I did receive a Facebook message from the Philippines from someone who tracked me down from my blog to ask me a very specific question about the moon phase during a certain position. She drew diagrams on a napkin and sent them from the other side of the world, neat!The question was: "I've been looking at the moon lately and I'm trying to solve something really important. I hope that you can help me... If the moon is waning or waxing [gibbous] in the morning, which phase has the top part left out?"So which phase has the top part missing in the early morning as shown in her diagram? This question is sort of backwards because it's all about identifying the name (waxing or waning gibbous) rather than the position.I don't have Stellarim on my computer at work (I decided to answer this on my lunch break) so I looked through my Star Walk app, and she also sent local times for moonrise and moonset. Here is what I came up with at the time, and then I'll expand using Stellarium to show a more accurate scene ...

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