![]() You have to be careful of the sign however. The latitude and longitude (in selenographic coordinates) of the feature in question can be looked up on a map, atlas, etc. ![]() Term= selenographic longitude of the terminator Longitude = selenographic longitude of the feature Latitude = selenographic latitude of the feature In this equation, there are several variables that correspond to the following:Ī= angle of elevation of the sun at the given point This is somewhat difficult to read in a typed line, but nevertheless the formula is as follows:Ī = arcsin ) ] Perhaps someone who is experienced at doing these calculations can clarify what is the best method. I found some other formulas, but they invoked spherical polar coordinates and were much more complicated. What I don't know is whether this formula is the best one to use, or if it makes certain assumptions. I was able to find the following trigonometric formula to calculate the angle of elevation of the sun at any given point on the moon at any given time, provided you have the selenographic coordinates of the feature and the exact universal time. Then, the height is equal to the product of the tangent of a and the distance, such that If you want to know the height (h) of a mountain above the surrounding terrain, all you need to know is the length of the shadow cast (d), and the angle of the sun at the time (a). Although the trigonometry is somewhat straightforward, there are numerous issues that make this a tricky problem and prone to some error. I wanted to try and use nothing more than an image, ephemeris data, and selenographic coordinates to perform the calculation of mountain height based on the length of the shadow cast. It’s worth checking out.I've never actually done this before, but this post has prompted me to do some reading, and I started playing around with some of my images to see what kind of estimates I could make. However, Lunarpedia is a wiki so other people might have added more information. Much of the information on this page is the same as the Lunarpedia because I also wrote that page. ![]() You can learn more about selenography at Lunarpedia. We’re going to need to learn everything we can about the Lunar terrain before we send Homesteaders there. Earth sciences (or Lunar sciences in this case)Ī short history of selenography, along with historical Lunar maps, can be found at Wikipedia ( ).Spatial analyses of human and natural phenomena.The four broad areas of geographical, and selenographical, research are: ![]() The third sub-discipline, environmental (or integrated) geography, is concerned with the interaction between the environment and humans. Selenography is closely linked to selenology, the study of the composition and processes of the solid material that makes up Luna, and often overlap each other.Įventually, with permanent human habitation, selenography will encompass the full range of topics covered by geology: studying people, communities, cultures, economies and their interactions with their location and environment (human selenography). Currently, Selenography focuses on the visible Lunar surface features and the Lunar natural environment where they are located and how they interact with each other (physical selenography). Selenography is deeper and more complex than the study of maps ( cartography) and place names ( toponymy). Selenography is the study of Lunar geography.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |