julian_day — DRIVE env op

• Data kinds: any → scalar

• Call: import fullseye as fs; fs.ledger.julian_day(when) -> 'float' (to call the implementation directly, import driveenv; driveenv.julian_day(when) -> 'float'; from the registry, opsdrive.get("julian_day"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

ユリウス日(UT)。`when` = タイムゾーンつきの datetime(UTC に直す)、または数(そのままユリウス日)。

素朴な(tzinfo の無い)datetime は 拒否する(地方時と UTC を取り違えると太陽が 9 時間ずれる)。

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• (none yet)

Ops the type connects to (they accept scalar as input)

spin_from_marker_sequence · road_eval · long_simulate · stopping_distance_grade · stop_line_plan · hill_hold_brake_min · hill_start_rollback · hill_start_command

Same category (env)

sun_at · sun_events · sun_vector · sun_illuminance · koschmieder · mor_from_beta · beta_from_mor · road_row_distance

*Provenance: driveenv.py — DRIVE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.