PyRank
brandon-rhodes

skyfield

Elegant astronomy for Python
PyPI GitHub
No known security advisories. The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.

skyfield has 585K monthly downloads and 2K GitHub stars. Version 1.54, first published in 2014.

It is stably maintained under a permissive license, last released in Jan 2026.

It is built on top of certifi, jplephem and numpy. It is used by 112 tracked packages, including setiastrosuitepro, act-atmos and zstarview.

Downloads
Day
18.1K
Week
134.2K
Month
584.5K
Stars
1.7K
Forks
253
Issues
95
Version
1.54

Package Insights

What's this?
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
80
Popularity
69
Adoption
67
Community
60
Provenance
0
How the maintenance status was determined
Last commit
65 days ago
Monthly downloads
584,530
Active
Activity within 30 days
• Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
584,530
Stars
1,736
Stars per 1k downloads
2.97
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
• Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
19,177
Month daily avg
19,484
Momentum
-1.6%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
Python version support tiers
requires_python
Not specified
Cutting Edge
Minimum supported version is 3.12 or newer
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
• Unknown
No requires_python specified or unparseable
Package does not declare a minimum Python version.
License categories
License
MIT
• Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
169 days ago
Total releases
68
Releases/year
5.5
Rapid
Last release within 365 days and > 12 releases/year
• Regular
Last release within 365 days
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
46
Monthly downloads
584,530
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
• Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
83
 
Issue Burden
54.7
per 1k stars
Discussions
113.5
per 1k stars
Fork Ratio
18.2%
contrib / forks
Stale Release
103d
 
PR Velocity
Quiet
 

Weekly Downloads

GitHub Stars

Not all downloads include detailed metadata. Breakdowns reflect the subset that does.

Downloads by OS

Linux 14.3K
Windows 517
macOS 164

Python Versions

3.12
37.4% 5.1K
3.11
33.4% 4.5K
3.9
12.5% 1.7K
3.14
8.9% 1.2K
3.10
7.7% 1.0K

Top Countries

1. US US
10.9K
2. FR FR
521
3. NL NL
442
4. IE IE
374
5. CN CN
348
6. AU AU
322
7. GB GB
306
8. SG SG
265
9. DE DE
256
10. CA CA
212

Package Information

License
MIT
First Release
January 21, 2014
Last Release
5 months ago
Last Commit
2 months ago
Latest Version
1.54
Total Releases
68
Contributors
46
Open PRs
16
Archived
No
Author
Brandon Rhodes
Python Versions
2.7 3.7 3.8 3.9 3.10 3.11 3.12 3.13
Wheels
py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh

Links