As of very recently Selden Ball's Celestia website gives 403 errors when trying to access it. The site was working as late as June 1st, 2022 judging by the last snapshot of it from the web archive.
If you need anything off of it you will need a copy of the site from the web archive: https://web.archive.org/web/20220601094425/https://www.classe.cornell.edu/~seb/celestia/
Note on Selden Ball's Celestia website
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Topic authorAnthony_B_Russo10 - Moderator
- Posts: 671
- Joined: 03.07.2018
- Age: 21
- With us: 5 years 10 months
- Location: Tallahassee, Florida, US
Note on Selden Ball's Celestia website
Anthony B. Russo, I like Pluto. Mod of the Celestia subreddit: https://www.reddit.com/r/Celestiasoftware/
I have over 40 computers, trying to list them here would be a pain.
Responsible for the NEO catalog: https://celestia.space/forum/viewtopic.php?f=23&t=22203
And mod of the Discord server.
I have over 40 computers, trying to list them here would be a pain.
Responsible for the NEO catalog: https://celestia.space/forum/viewtopic.php?f=23&t=22203
And mod of the Discord server.
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SevenSpheres
- Moderator
- Posts: 820
- Joined: 08.10.2019
- With us: 4 years 7 months
Grant Hutchison's orbit conversion spreadsheet is still available through the Wayback Machine, but I'll upload it here too:
excel.zip- (25.71 KiB) Downloaded 225 times
My Addons: viewtopic.php?f=23&t=19978 • Discord server admin
Celestia versions: 1.5.1, 1.6.1, 1.6.2, 1.7.0, and some unofficial versions like Celestia-ED
Celestia versions: 1.5.1, 1.6.1, 1.6.2, 1.7.0, and some unofficial versions like Celestia-ED
This is strange. The Celestia pages cannot be accessed:
https://www.cornell.edu/search/?q=celestia+site:classe.cornell.edu
https://www.cornell.edu/search/?q=celestia+site:classe.cornell.edu
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John Van Vliet
- Posts: 2940
- Joined: 28.08.2002
- With us: 21 years 8 months
I think he is on Facebook. Any Facebook friends here?
Added after 3 hours 22 minutes:
Selden E. Ball, Jr vCard
General Information
TYPE: retiree
NETID: seb1
EMAIL: seb1@cornell.edu
WEBSITE: https://www.classe.cornell.edu/~seb/
Other Information
CREATED: 21 years ago
MODIFIED: 2 days ago
Personal information appearing (or not appearing) above is subject
https://www.cornell.edu/search/people.cfm?netid=seb1
Added after 3 hours 22 minutes:
Selden E. Ball, Jr vCard
General Information
TYPE: retiree
NETID: seb1
EMAIL: seb1@cornell.edu
WEBSITE: https://www.classe.cornell.edu/~seb/
Other Information
CREATED: 21 years ago
MODIFIED: 2 days ago
Personal information appearing (or not appearing) above is subject
https://www.cornell.edu/search/people.cfm?netid=seb1
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SevenSpheres
- Moderator
- Posts: 820
- Joined: 08.10.2019
- With us: 4 years 7 months
Sorry I haven't been present here much lately. There's no reason for my Celestia pages to go away, even if I do 
Recent outages would have been due to maintenance being done on the networks and servers at the hosting site.
ETA:
Every couple of years there's also a building-wide power outage while work is done on the 13KV power distribution system. Yeah, the building has several 13 KiloVolt feeds from a nearby power substation. They usually aren't all down at the same time, but the building's backup generator has relatively limited capacity. Power outages used to happen occasionally because of squirrels shorting out the substation's capacitor bank, but that stopped when they finally got around to running those lines underground.
Recent outages would have been due to maintenance being done on the networks and servers at the hosting site.ETA:
Every couple of years there's also a building-wide power outage while work is done on the 13KV power distribution system. Yeah, the building has several 13 KiloVolt feeds from a nearby power substation. They usually aren't all down at the same time, but the building's backup generator has relatively limited capacity. Power outages used to happen occasionally because of squirrels shorting out the substation's capacitor bank, but that stopped when they finally got around to running those lines underground.
Selden
Notice of site outage:
My Web pages ( https://www.classe.cornell.edu/~seb etc) will be unavailable starting at about 6 AM US Eastern Time (10 AM UTC) on Friday, July 28, 2023, until about 6 PM (10 PM UTC) on Monday, July 31, due to a building-wide power outage. They're going to be inspecting and cleaning the building's power transformers and switching gear.
My Web pages ( https://www.classe.cornell.edu/~seb etc) will be unavailable starting at about 6 AM US Eastern Time (10 AM UTC) on Friday, July 28, 2023, until about 6 PM (10 PM UTC) on Monday, July 31, due to a building-wide power outage. They're going to be inspecting and cleaning the building's power transformers and switching gear.
Selden