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feat: Add some more (astro)angle aliases #229

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Merged
MilesCranmer merged 1 commit into from
Jul 10, 2026
Merged

feat: Add some more (astro)angle aliases #229

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8 changes: 7 additions & 1 deletion src/units.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -242,7 +242,7 @@ end
@add_prefixes sr ()

@doc(
"Angle in radians. Note that the SI definition is simply 1 rad = 1, so use symbolic units to avoid this. Available variants: `nrad`, `μrad` (/`urad`), `mrad`, `deg`, `arcmin`, `arcsec`, `μarcsec` (/`uarcsec`), `marcsec`.",
"Angle in radians. Note that the SI definition is simply 1 rad = 1, so use symbolic units to avoid this. Available variants: `nrad`, `μrad` (/`urad`), `mrad`, `deg` (/`°`), `arcmin`, `arcsec`, `μarcsec` (/`uarcsec`, `μas`, `uas`), `marcsec` (/`mas`).",
rad,
)
@doc(
Expand All @@ -251,13 +251,19 @@ end
)

@_lazy_register_unit deg pi / 180 * rad
@_lazy_register_unit ° deg
@_lazy_register_unit arcmin deg / 60
@_lazy_register_unit arcsec arcmin / 60

@add_prefixes deg ()
@add_prefixes arcmin ()
@add_prefixes arcsec (μ, u, m)

# Standard astronomy abbreviations for (sub)arcsecond angles
@_lazy_register_unit μas μarcsec
@_lazy_register_unit uas uarcsec
@_lazy_register_unit mas marcsec

## Magnetic flux densities
@_lazy_register_unit Gauss 1e-4 * T

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11 changes: 11 additions & 0 deletions test/unittests.jl
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Expand Up @@ -703,6 +703,17 @@ end
@test ustrip(z) ≈ 60 * 60 * 24 * 365.25
@test z == uparse("yr")

# `°` is an alias for `deg`
@test u"°" === u"deg"
@test u"90°" ≈ u"rad" * π / 2
@test uexpand(us"°") == uexpand(us"deg")

# `mas`/`μas`/`uas` are astronomy aliases for (sub)arcsecond angles
@test u"mas" === u"marcsec"
@test u"μas" === u"μarcsec"
@test u"uas" === u"uarcsec"
@test u"μas" === u"uas"

# Test type stability of extreme range of units
@test typeof(u"1") == DEFAULT_QUANTITY_TYPE
@test typeof(u"1f0") == DEFAULT_QUANTITY_TYPE
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