The measurement of the height of lunar features by measuring the length of the cast shadows - December 28, 2014

Height of Lunar Features

The measurement of the height of lunar features by measuring the length of the cast shadows - December 28, 2014
The measurement of the height of lunar features by measuring the length of the cast shadows – December 28, 2014

Lunar Features at First Quarter
Lunar Craters and Montes
Dunboyne, County Meath, Ireland
28/12/2014
Graphite pencils plain paper

This is a sketch I did as part of an assignment for an Astronomy course I am taking for fun. The exercise was to calculate 4 lunar features heights by making accurate sketch observations, measuring the shadows and calculating the height using the distances along with the Earth-Sun-Moon angles. It just happened to be clear at exactly first quarter. I am having trouble sketching a very dark black and new to many of the sketching techniques and making it up as I go along. Is there an extra dark lead past an 8b or should I be looking sketch on black paper? I am also having problems scanning and am taking photos of my sketches? Any help appreciated. Clear Skies! Kevin


6 thoughts on “Height of Lunar Features”

  1. Kevin,

    I am seeing no problems with your sketching technique. Outstanding work here, keep making it up. You are doing a fine job! If you want to make a region darker you can try black marking pen or black wax pencil, but really your dark regions looks excellent. Your photo of the sketch also shows a lot of detail. I normally scan at -8 brightness and +8 contrast. I dont know if this will help you or not.

    I would very much like to learn the details of how you calculate the lunar feature heights using the shadows.

    Cindy Krach

  2. Well done Kevin, I did this exercise a lot of years ago,… It’s quite easy with very few trigonometry.
    For the paper scaning, it´s more easy while your paper has the same dimension that your scanner.
    The contrast ideas of Cindy are good, I use black china ink as well.
    Michel

  3. Kevin,

    Your sketches are excellent.

    Back in the 1980’s my son wanted to do the same project you have done here.
    He used a camera and one of my telescopes to get film pictures.
    Once you have the sun’s altitude it is simple trigonometry.

    Frank 🙂

  4. Hi Cindy, If you send me your email address I will post you the lunar height calculation details.

    Kevin

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