Skip to comments.Astronomy Picture of the Day -- High Noon Analemma Over Azerbaijan
Posted on 10/13/2013 9:13:25 PM PDT by SunkenCiv
Explanation: Is the Sun always straight up at noontime? No. For example, the Sun never appears directly overhead from locations well north or south of the Earth's equator. Conversely, there is always a place on Earth where the Sun will appear at zenith at noon -- for example on the equator during an equinox. Turning the problem around, however, as in finding where the Sun actually appears to be at high noon, is as easy as waiting for midday, pointing your camera up, and taking a picture. If you do this often enough, you find that as the days march by, the Sun slowly traces out a figure eight on the sky. Pictured above is one such high noon analemma -- a series of pictures always taken at exactly noontime over the course of a year. The above fisheye image, accumulated mostly during 2012, also shows some buildings and trees of Baku, Azerbaijan around the edges.
(Excerpt) Read more at asterisk.apod.com ...
Simply amazing. Thanks.
An analemma is depicted in the Tom Hanks film, CASTAWAY. He draws one on the wall of a sort of cave, where the sun shadow forms a spot.
This was a counterfactual depiction, as note the statement in the article that the image, or record, in the CASTAWAY case, must be made at NOON, which means clocktime. If you took it at “solar noon” it would just mean marking it in a straight line.
And I my hobby is rolling and welding “true” armillary spheres, accurate for the location of the sunrise, zenith and sunset for every day of the year for the latitude the sphere is located!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.