• You will need to login or register before you can post a message. If you already have an Agriville account login by clicking the login icon on the top right corner of the page. If you are a new user you will need to Register.

Announcement

Collapse
No announcement yet.

Is moonlight cold?

Collapse
X
Collapse
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Is moonlight cold?

    Every farmer knows that clear skys on a full moon is a recipe for frost. Have a few sections of canola very vulnerable. Was 2C at 1am last night then luckily a few clouds rolled in and the temp rose only to clear off again at 4 am and cooled to 0.5C at 6am.. I was under the common assumption that the clouds insulate, but im starting to question if that is correct. A number of amateur experiments that measure the temperature of objects under moonlight vs shade show objects cooler under moonlight. That would suggest that the light from the moon is actually a cold light and cools the surface upon which it shines. When covering garden vegetables with ole bed sheets is it actually protecting the vegetables from the moonlight and not its insulating effect that saves em?
    Interesting if so, hope to take some pictures tonight with my flir thermal camera under the full moon vs shade.
    Last edited by biglentil; Sep 10, 2022, 14:31.

    #2
    Originally posted by biglentil View Post
    Every farmer knows that clear skys on a full moon is a recipe for frost. Have a few sections of canola very vulnerable. Was 2C at 1am last night then luckily a few clouds rolled in and the temp rose only to clear off again at 4 am and cooled to 0.5C at 6am.. I was under the common assumption that the clouds insulate, but im starting to question if that is correct. A number of amateur experiments that measure the temperature of objects under moonlight vs shade show objects cooler under moonlight. That would suggest that the light from the moon is actually a cold light and cools the surface upon which it shines. When covering garden vegetables with ole bed sheets is it actually protecting the vegetables from the moonlight and not its insulating effect that saves em?
    Interesting if so, hope to take some pictures tonight with my flir thermal camera under the full moon vs shade.
    Interesting conundrum. Kind of bordering on metaphysical realms. Another thought clouds indicate humidity which holds back frost vs clear sky. Common gardener trick is to water the plants if a frost is imminent. Hope the f word stays away for your crops to make it.

    Comment


      #3
      Placed two very similar sized squash and two jars of water. One side in moonlight shade other in the moonlight. Though it was a bit breezy last night and I think that would moderate results, I did measure that both items in the shade remained 1 degree C warmer at 10pm. Here is a picture of what last nights full moon looks like in a thermal image, red arrow points to it, skys completely clear. Have no idea what the blob slightly underneath the moon is. Anyway if the moon is reflecting sunlight I would expect it to be warm under thermal imaging, it aint.

      Click image for larger version

Name:	Screenshot_20220911_071634.jpg
Views:	1
Size:	53.3 KB
ID:	773785
      Last edited by biglentil; Sep 11, 2022, 08:04.

      Comment

      • Reply to this Thread
      • Return to Topic List
      Working...
      X

      This website uses tracking tools, including cookies. We use these technologies for a variety of reasons, including to recognize new and past website users, to customize your experience, perform analytics and deliver personalized advertising on our sites, apps and newsletters and across the Internet based on your interests.
      You agree to our and by clicking I agree.