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Technical name for 'day' on other planets

  1. Apr 9, 2004 #1

    enigma

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    Does anyone know if there is a (short) technical name for a "Lunar day-night cycle" (28 Earth days)?

    We're afraid that simply saying "Lunar Day" might be misconstrued as the 14 day period which a site would be in the sun, and typing "Lunar day-night cycle" is becoming rediculous when it needs to be referenced several times in one paragraph.

    We've been calling it a "sol", but I don't think that's a typical term.
     
    Last edited: Apr 9, 2004
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  3. Apr 10, 2004 #2

    Ivan Seeking

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    I looked around a bit and saw other people struggling with the same problem. I saw either day/night cycle, lunar day, or if you plan to publish in Hebrew, a molad.

    The calendar is based on virtual lunar conjunctions called "molads" spaced precisely 29 days, 12 hours, and 793 parts apart

    http://en.wikipedia.org/wiki/Hebrew_calendar
     
  4. Apr 10, 2004 #3

    marcus

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    molad has a really nice sound
    this last post shows editorial flair. the kerry quote is well chosen from among many possible things that could have had similar impact
    the finding of "molad" is like a small prize for Ivan having done the "seeking"
    research----editors of magazines do a lot of fact-checking in obscure references, if they are good. it has this flavor. You could edit a small science-related magazine that would be interesting or attract a following, or a blog.

    to toss in some more arcana, my astrophysics handbook lists several months

    siderial period----around 27.3
    synodical month-----what you call molad, new moon to new moon
    tropical month-----around 29.3
    anomalistic month----perigee to perigee
    nodical month------node to node


    This suggests to me that one alternative to saying "molad" would be
    to say "synod"
    as a shortening of "synodical month"

    but what would really be wrong with simply saying "month"
    it must come from moon because it sounds like "moonth"
    probably there are some people who say "lune" for the 29.5 earthday period
    regards to Tsu
     
  5. Apr 10, 2004 #4

    chroot

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    People call the Martian day a "sol." I think the world "sol" could apply equally well to any planet.

    - Warren
     
  6. Apr 10, 2004 #5

    Tsu

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    Thanks, Marcus! Back at ya! (sure wish I had spent less time on my professional CE and more on LQG now that Rovelli and Baez have visited! :wink: Dang! Don't let them get away! :biggrin: )

    I thing molad has a very nice ring to it. (could be a function of my Jewish ancestry :wink: )

    Synod - sounds like a religious ecclesiastical council... :eek:

    Lune? - hey! you talkin' 'bout me again???

    Moonth - hmmmm... it has certain possibilities...

    If this is a democratic thread, I vote for molad. :biggrin:
     
  7. Apr 10, 2004 #6

    enigma

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    Well, there will be some NASA bigwigs at the comprehensive design review for my senior design class. Don't want to sound like an idiot at that presentation or in the project writeup. :cool:
     
  8. Apr 10, 2004 #7

    Tsu

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    Hey! Whose ancestral language are you calling idiotic!! :tongue:
    Fine. BE picky, then. :tongue: :biggrin:
    If you don't like Hebrew, would Hindu be more acceptable?

    http://www.encyclopedia4u.com/t/tithi.html

    This assumes, of course, that the NASA bigwigs are into vedic timekeeping... :wink:
     
    Last edited: Apr 10, 2004
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