hebl / gofa

Golang standards Of Fundamental Astronomy

中文

GoFA (Golang standards Of Fundamental Astronomy)

GoFA is a pure Golang implementation derived from the International Astronomical Union's (IAU) "Standards Of Fundamental Astronomy (SOFA) http://iausofa.org" library official C release. .

Reference documents are in: https://pkg.go.dev/github.com/hebl/gofa

GoFA Current version is 1.19. It is based on SOFA version 19 (2023-10-11).

Examples in manuals are in the subdirectory: examples

All function are tested. The test functions are derived from t_sofa_c.c .

Installation

go get -u github.com/hebl/gofa

or

go install github.com/hebl/gofa@latest

Functions

Vector/Matrix Library vml.go

• Initialization (4)
• Copy/Extend/Extract (5)
• Build rotations (3)
• Operations on vectors (17)
• Operations on matrices (2)
• Matrix-vector products (4)
• Rotation vectors (2)

Angle angle.go

• Spherical/Cartesian conversions (6)
• Separation and position-angle (4)
• Operations on angles (8)

Astrometry (38) astrometry.go

Calendars (7) jd.go

Time Scales (20) ts.go

Coordinates coord.go

• Ecliptic Coordinates (6)
• Galactic Coordinates (2)
• Horizon/Equatorial Coordinates (3)
• Geocentric/Geodetic Transformations (5)

Earth Rotation and Sidereal Time (15) erast.go

Ephemerides (3) ephem.go

Fundamental Arguments (14) fundargs.go

Gnomonic Projections (6) projection.go

Precession/Nutation/Polar Motion (64) pn.go

Star Catalog Conversions (9) catalog.go

Versions

v1.19

Version 1.19 offers 192 routines for astronomy library (including time scales, earth rotation, sidereal time, precession, nutation, polar motion, ephemerides, astrometry and transforms between various reference systems.), 55 routines for vector/matrix library.

License

• SOFA License
• MIT License

2023-10-23