How do I install the Tempo Jl skill?

Run npx skillmds@latest add majiayu000/tempo-jl in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Tempo Jl safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Tempo Jl?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Tempo Jl free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Tempo Jl?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Tempo Jl by majiayu000 — Agent Skill

Name: Tempo Jl
Rating: 4.5 (4 reviews)
Author: majiayu000

File contents

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)

---name: tempo-jldescription: 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.--- # Tempo.jl Astronomical time transformations with split-second precision. Repo: [JuliaSpaceMissionDesign/Tempo.jl](https://github.com/JuliaSpaceMissionDesign/Tempo.jl) ## Core Types ```julia 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 ```julia 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 ```julia 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 ```julia 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 ```julia 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 ```julia @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)

Frequently asked questions

Tempo Jl