Agent skill
tempo-jl
Tempo.jl for efficient astronomical time representations and transformations between timescales. Use when working with Epoch types, converting between timescales (TDB, TT, UTC, TAI, UT1), or defining custom timescales.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/tempo-jl-hammerhead-space-agenticcodingrules
SKILL.md
Tempo.jl
Astronomical time transformations with split-second precision. Repo: JuliaSpaceMissionDesign/Tempo.jl
Core Types
Epoch{S, T} # Time in timescale S with numeric type T
Duration{T} # Integer seconds + fractional seconds (split for precision)
DateTime{T} # Calendar date + time wrapper
Creating Epochs
ep = Epoch(0.0, TDB) # J2000 in TDB
ep = Epoch(86400.0, TT) # 1 day after J2000 in TT
ep = Epoch("2024-01-05T12:00:00.000 TDB") # ISO string
ep = Epoch("JD 2460000.5 TDB") # Julian Date
ep = Epoch("MJD 58849.0 TDB") # Modified Julian Date
ep = Epoch{TDB}(seconds) # Typed constructor
Timescale Conversion
ep_tt = convert(TT, ep_tdb) # TDB -> TT
ep_utc = convert(UTC, ep_tt) # TT -> UTC
Available Timescales
TDB, TT, TAI, UTC, TCG, TCB, UT1, TDBH, GPS
Epoch Accessors
value(ep) # Seconds since J2000
j2000(ep) # Days since J2000
j2000s(ep) # Seconds since J2000
j2000c(ep) # Centuries since J2000
timescale(ep) # Get the timescale
doy(ep) # Day of year
Epoch Arithmetic
ep2 = ep + 3600.0 # Advance by seconds
ep3 = ep - 86400.0 # Go back by seconds
dt = ep2 - ep1 # Duration between (same timescale only)
range = ep1:60.0:ep2 # Range of epochs
ep1 < ep2 # Comparison
Custom Timescales
@timescale NTS 100 NewTimeScale # Define a new timescale
add_timescale!(TIMESCALES, NTS, offset_fun) # Connect to graph
Key Conventions
- Internal representation: split integer + fractional seconds since J2000
- Default timescale: TDB (Barycentric Dynamical Time)
- Graph-based: timescales are nodes, offset functions are edges
- Leap seconds handled automatically (UTC<->TAI)
- AD-compatible via FunctionWrappersWrapper
DJ2000 = 2451545(J2000 Julian Date constant)
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