Can you provide a source for 14 orbits? Everything in my search results says 13 and some change.
Wikipedia says one sidereal month is 27.321661 days and a sidereal year is 365.256 days.
365.256/27.321661 ≈ 13.37
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mnemonicmonkeys@sh.itjust.works 3 days agoYou don’t know what you’re talking about
13x28=364. The moon makes 14 sidereal orbits, not 13. The reaaon the year is split into 12 months is a combination of Roman dipshittery and the fact that 12 is divisible by 2, 3, 4, and 6. The number of factors of 12 made 12 and 60 way easier to work with for societies that hadn’t invented the decimal point yet.
stray@pawb.social 2 days ago
mnemonicmonkeys@sh.itjust.works 2 days ago
a sidereal year is 365.256 days.
No. A sidereal year is 366.24 days.
And 11 days isn’t “and some change”
stray@pawb.social 2 days ago
The figures in my post are ephemeris days since that’s the way Wikipedia lists them.
en.wikipedia.org/wiki/Sidereal_year
en.wikipedia.org/wiki/Lunar_month#Sidereal_month
“And some change” is a phrase to refer to a number following a decimal point, meaning the sources I find claim there are thirteen point something sidereal months per year, at a figure too low to round to 14. Here are some example sources:
en.wikipedia.org/wiki/Orbit_of_the_Moon#Lunar_per…
scienceline.ucsb.edu/getkey.php?key=1126
I still can’t find a source which says the moon makes 14 sidereal orbits per year, using any definition of year.
NeatNit@discuss.tchncs.de 3 days ago
Then please explain how the Hebrew calendar, and all other lunisolar calendars (calendars which follow both the solar year and the lunar cycle) have 12 months most years? en.wikipedia.org/wiki/Lunisolar_calendar
“The majority of years have twelve months but every second or third year is an embolismic year, which adds a thirteenth intercalary, embolismic, or leap month.”
stray@pawb.social 2 days ago
Not who you asked, but after looking into it it’s because the moon takes about 29.5 days to complete a full cycle of phases (one synodic month), giving it time to do so roughly 12 times per year.
I can’t quite wrap my head around it, but I think the explanation for why sidereal and synodic months differ lines up with your initial explanation. Because we’re also moving, the moon has to move further to achieve the visual change of moon phases.
NeatNit@discuss.tchncs.de 1 day ago
Thanks. I think the user who replied to me is the one with no idea that they’re talking about. No way of measuring it comes close to 14.