07-02-2007, 12:20 PM
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Blacktown isn't so black
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Join Date: Jan 2007
Location: Prospect, NSW, 2148
Posts: 1,316
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Quote:
Originally Posted by erick
Hey tailwag,
See the article by Damian Peach on Jupiter in 2007. Note the illustrations on the first page (also note that the centre and bottom illustrations have been swapped! When you read the caption, this becomes clear.) The main point I wanted to make is his mention that "in all instances north is up".
http://damianpeach.com/images/articl...07/Jupiter.pdf
Eric  |
Bummer, I just wrote an huge reply to you erick and then went off to check spelling and lost the lot 
Okay, so a quick rewrite, I viewed the 3 B&W images facing North and the larger colour image facing South, and using the middle of the 3 B&W images I located the GRS on both, which as you can expect were reversed (top left as opposed to bottom right).
This is fine because the author told me so  but what about when I am alone and trying to figure out the cardinal direction of an object?
Here is my underling question, in astronomy generally, notwithstanding the inverse situation of a telescope, do we [A] Refer to the object when we speak of its orientation, [b] ever refer to our own orientation on Earth, [C] is there a standard to be observed.
If as I suspect that most people and software refer to the cardinal direction of the object they are viewing and not themselves, then HOW is the determination made as to what the orientation of that object is, is it [A] taken from the Celestial Equator, [b] Celestial (Southern or Northern) Pole and is it taken using me (the observer) as a third triangulation point?
All I really want to know is - what is the exact formula for working out - when I view a celestial object - whether I am seeing the North of the object, or the South or for that matter, it's East or West as it relates to me.
The second part of the question, assuming the first part is answered and I can understand it, is - does everyone use this, so that when we view an image on this forum or in a book, and assuming we know what it was taken with (assuming a telescope), we can all know what direction the top of the image is.
Sorry to be so long winded, it was better written the first time 
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