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# Tag Info

## Hot answers tagged the-moon

7

The possibility you mention is feasible if the moon is in the equivalent of a geostationary orbit, where the orbital period of the moon is exactly the rotation period of the planet and it orbits in the equatorial plane of the planet. Such a moon would always keep the same face to the planet if it were close enough to the planet (which in turn depends on the ...

4

I asked the same question on the Usenet group sci.astro and received the following helpful reply from Barry Schwarz that goes some way towards an answer, reposted here with permission. But the question remains hard. I have not seen this cycle addressed in any astronomical textbook, although it may be in one that I haven't looked at. Since the Sun's ...

2

Thank you for your guiding comments. Compute Moon's declination and searching for "ascending and descending nodes" can be quite easily achieved though skyfield API so I am posting some starter python code here: from calendar import monthrange from skyfield.api import load planets = load('de431_part-2.bsp') earth, moon = planets['earth'], planets['moon'] ...

2

The illuminated fraction k is related to the Sun-Moon-Earth phase angle i by $$k = \frac{1 + \cos i}{2}$$ At full moon, $i \approx |\beta|$ where β is the Moon's ecliptic latitude, so k is between 0.998 and 1.000. The Moon crosses the ecliptic twice each draconic month. Synodic (29.53 day) and draconic (27.21 day) months together have a beat cycle ...

1

I think it's good to start with the last question: How would the tides be affected without the Moon? The answer is simple: There would still be tides twice a day caused by the Sun, but they would be smaller. There are lots of sources online that talk about how tides from the Sun and Moon combine; without the Moon, we would just have the tides from the Sun. ...

1

Adding to @stephenG's answer, the related Wikipedia page Lunar month can be used to get an idea of what the various terms mean. I have to agree though that one should probably try to get away with just using the word month while distracting the person you're talking to (cough or drop something) and then quickly moving on, because any term that's more ...

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