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Planning

Discussion in 'Observing Celestial Objects' started by Seer, Feb 24, 2019.

Planning

Started by Seer on Feb 24, 2019 at 7:35 PM

17 Replies 366 Views 2 Likes

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  1. Seer

    Seer Well-Known Member

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    I just put this together. I'm hoping that it will help with observing lunar features via different lighting angles.
     
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  2. Seer

    Seer Well-Known Member

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    It can't be made 100% accurate. There is some wiggle room. Hopefully it will be close enough to be useful.
    You read down the columns vertically. It helps you with viewing lunar features at lunar sunrise and sunset. If you see a feature on lunar day 3 and want to study it more in depth the terminator will be back to it again on the 17th lunar day but the contrast will be flipped.
    I came up with the chart/graph but not the data. The data is from the book WHAT'S HOT ON THE MOON TONIGHT? by ANDREW PLANCK.
    It will be interesting to see how accurate and useful it is. If I do find it to be off a bit I could always tweak it.
     
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  3. Seer

    Seer Well-Known Member

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    This might be useful to some with the above chart.
    The drawing is off slightly but still useful and some of the info is the establishments old way of doing things but still may be used by some.
     
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  4. sickfish

    sickfish Well-Known Member

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    looks good Donald
     
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  5. Seer

    Seer Well-Known Member

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    Moon Diameter 2,100 miles (3,400 km)
    Terminator Speed 10 mph
    Diameter x Pi = Circumference
    2,100 x 3.14 =6,594 miles

    1/2 Moon
    6,594 ÷ 2 = 3,297 miles
    3,297 ÷ 10 = 329.7 hours
    329.7 ÷ 24 = 13.7375 days

    1/4 Moon
    6,594 ÷ 4 = 1648.5 miles
    1648.5 ÷ 10 = 164.85 hours
    164.85 ÷ 24 = 6.86875 days

    So far this seems to be going good. If I was to do this by myself I probably would have listed the Terminator Longitudes by lunar day more uniformly like about every 12.857 degrees but that would probably be wrong. The curvature of the Moon probably effects our perception of the terminator speed a crossed it at different locations.
    It puzzles me the lack of uniformity between the eastern and western sides of the Terminator Longitudes :confused: They are not that far off from each other at all. Maybe they could be made more uniform for the purposes of acceptance, aesthetics, and my mental health.
     
    Last edited: Feb 27, 2019
  6. Seer

    Seer Well-Known Member

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    CLOSE ONLY COUNTS IN HORSESHOES, HANDGRANADES, AND MOST OF ASTRONOMY
     
  7. Seer

    Seer Well-Known Member

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    The devils in the details here are the moon's wobble, curvature, and probably some other things.
     
  8. Seer

    Seer Well-Known Member

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    This is what it would be if we radiate it out from 0 degrees using 7 divisions of 90 degrees (12.857142) and rounding off.
    77 - 64 - 51 - 38 - 26 - 13 - 0 - 13 - 26 - 38 - 51 - 64 - 77 - 90
    The right side of the chart in the photo shows greater discrepancies.
    Am I down the rabbit hole yet?
     
  9. Seer

    Seer Well-Known Member

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    Hey, what if I honor astronomy's counter intuitiveness and try to increase its exactitude by making it less accurate.
    One figure is given per lunar day when the terminator clearly travels over a range.
    So the terminator travels at 10 mph x 24 hours = 240 miles per day.
    90 degrees ÷ 7 = 12.857142 degrees per day.
     
  10. Ed D

    Ed D Well-Known Member

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    That is really beautiful work!

    Ed D
     
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  11. Seer

    Seer Well-Known Member

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    I stopped trying to work on it Ed. It was driving me nuts.
    Does anyone else know of a chart like this one? A lot of times when I come up with something I then find out that it or something like it already exists. I wish that someone who knows more then me would look it over and try to correct or improve it.
    Look at the difference between this and the above.
    180 degrees ÷ 29 days = 6.2068965 degrees :confused:
     
    Last edited: Mar 1, 2019
  12. Seer

    Seer Well-Known Member

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    I just made another attempt to try an elicit some help with this.
     
  13. sickfish

    sickfish Well-Known Member

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    Math...…..yuck:eek:
     
  14. Gabby76

    Gabby76 Well-Known Member

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    An excellent project and nicely done!
    I used to make a lot of charts myself as I also enjoy observing the different features on the lunar surface.
    A good lunar observing program is The Virtual Moon Atlas: https://sourceforge.net/projects/virtualmoon/
    It will give you a lot of very good information on observing though it does not give specifics for features such as the lunar X.

    If you can afford it this handbook has excellent information on lunar observing as well as most other aspects of the hobby as well: https://www.shopatsky.com/rasc-observers-handbook-2019
     
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  15. Gabby76

    Gabby76 Well-Known Member

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    To chart everything there is a great amount that needs to be taken into consideration and the fact that the Moon wobbles in its elliptical orbit does not help either. :)
     
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  16. Seer

    Seer Well-Known Member

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    I said from the beginning that it could not be made 100% accurate but I would like to see better uniformity.
     
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  17. Gabby76

    Gabby76 Well-Known Member

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    It can be made 100% if you have a few years to dedicate yourself to do it :)
    Luckily, we today can relax and enjoy all of the effort put in by the nice gentlemen from the 1600-1700!
     
  18. Seer

    Seer Well-Known Member

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    I had a wonderful idea this morning about doing astronomy log practice sheets and when I went looking for some paper I came a cross this. It is the beginnings of a new chart. As far as I know now I would have to gather my own data to make it. Very experienced astronomers might not need this but to others it should be very helpful. I don't know if I will work towards finishing it. I don't have the incentive to do anything anymore.
    Is there an equation out there that does this already?
    Still an easy peasy lemon squeezy chart would be nicer.
    Would it be a static or dynamic chart, I don't know.
     
    Last edited: Mar 9, 2019

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