Name of projection to firmamentum (celestial sphere)

  • B
  • Thread starter DrDu
  • Start date
  • #1
DrDu
Science Advisor
6,200
859
Summary:
Does the central projection of the position of a star to the firmamentum (celestial sphere) has a special name?
Does the central projection of the position of a star to the firmamentum (celestial sphere) has a special name?
 
Last edited:

Answers and Replies

  • #2
tech99
Gold Member
2,280
887
Celestial Position?
 
  • #3
phyzguy
Science Advisor
4,961
1,905
Celestial Coordinates? RA and Dec?
 
  • #4
DrDu
Science Advisor
6,200
859
There is orthogonal projection from space to the plane.
I thought of something like gnomonic projection, but this is from the sphere to a plane. I find it strange that the more obvious projection from space to a sphere has no proper name.
 
  • #5
phyzguy
Science Advisor
4,961
1,905
Normally when you take coordinates and project them down to a space with smaller dimension by just eliminating one coordinate, you just call it a "projection". That's what's being done here. I don't know that it needs a special name, since it's such a simple concept.
 
  • #6
DrDu
Science Advisor
6,200
859
Of course today we consider this trivial. But I thought that some medieval monks and arab sky mongers created thousand of strange names for it.
 
  • #7
phyzguy
Science Advisor
4,961
1,905
Of course today we consider this trivial. But I thought that some medieval monks and arab sky mongers created thousand of strange names for it.
It was way before that. Hipparchus created the first map of the celestial sphere in the second century BC.
 

Related Threads on Name of projection to firmamentum (celestial sphere)

  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
6
Views
4K
Replies
8
Views
3K
Replies
7
Views
1K
  • Last Post
Replies
20
Views
12K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
1
Views
2K
Top