Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Forums  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear
Guest
Forums  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear
Register to forums    Log in

 
FORUMS Photo Sharing & Discussion Astronomy & Celestial 
Thread started 02 May 2015 (Saturday) 09:17
Search threadPrev/next
sponsored links (only for non-logged)

Complete Newb Question

 
MakeMeShutter
Goldmember
Avatar
1,343 posts
Likes: 28
Joined Jan 2009
Location: Upstate New York
     
May 02, 2015 09:17 |  #1

I was just using Stellarium and noticed that when I overlaid the equatorial grid and zoomed in on the North star that it did not align with the center point of the grid.
Does this mean that polar alignment using the North star is slightly off?
Thanks in advance,
--Shawn


New York Dragonflies (external link)
NYDragonflies.com

  
  LOG IN TO REPLY
hollis_f
Cream of the Crop
Avatar
10,649 posts
Gallery: 1 photo
Likes: 85
Joined Jul 2007
Location: Sussex, UK
     
May 02, 2015 23:30 |  #2

Yes, Polaris isn't exactly at the pole, but it's close enough for polar alignment in the vast majority of cases. If you look at a star trail image you can see hat Polaris makes a small arc, if the acquisitions time is long enough.


Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
Gear Website (external link)

  
  LOG IN TO REPLY
MakeMeShutter
THREAD ­ STARTER
Goldmember
Avatar
1,343 posts
Likes: 28
Joined Jan 2009
Location: Upstate New York
     
May 04, 2015 06:45 as a reply to  @ hollis_f's post |  #3

I learned something new, thanks hollis_f.
I greatly appreciate you taking time to answer.
--Shawn


New York Dragonflies (external link)
NYDragonflies.com

  
  LOG IN TO REPLY
Left ­ Handed ­ Brisket
Combating camera shame since 1977...
Avatar
9,925 posts
Gallery: 15 photos
Likes: 2398
Joined Jun 2011
Location: The Uwharrie Mts, NC
     
May 04, 2015 07:23 |  #4

see also: http://en.wikipedia.or​g/wiki/Axial_precessio​n (external link)

The precession of the Earth's axis has a number of observable effects. First, the positions of the south and north celestial poles appear to move in circles against the space-fixed backdrop of stars, completing one circuit in approximately 26,000 years. Thus, while today the star Polaris lies approximately at the north celestial pole, this will change over time, and other stars will become the "north star".[2] In approximately 3200 years, the star Gamma Cephei in the Cepheus constellation will succeed Polaris for this position. The south celestial pole currently lacks a bright star to mark its position, but over time precession also will cause bright stars to become south stars. As the celestial poles shift, there is a corresponding gradual shift in the apparent orientation of the whole star field, as viewed from a particular position on Earth.


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
  LOG IN TO REPLY
MakeMeShutter
THREAD ­ STARTER
Goldmember
Avatar
1,343 posts
Likes: 28
Joined Jan 2009
Location: Upstate New York
     
May 04, 2015 08:42 as a reply to  @ Left Handed Brisket's post |  #5

Wow, very interesting stuff.
I wonder how many people don't know this?
Thanks Left Handed Brisket.


New York Dragonflies (external link)
NYDragonflies.com

  
  LOG IN TO REPLY
sponsored links (only for non-logged)

1,352 views & 0 likes for this thread, 3 members have posted to it.
Complete Newb Question
FORUMS Photo Sharing & Discussion Astronomy & Celestial 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Forums   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset   •  Home

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.58forum software
version 2.58 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is semonsters
1546 guests, 135 members online
Simultaneous users record so far is 15,144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.