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

Julian day (UT). when = a timezone-aware datetime (converted to UTC), or a number (taken as the Julian day as is).

A naive datetime (without tzinfo) is rejected (mixing up local time and UTC shifts the sun by 9 hours).

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)

• gallery_drive_lateral_env — py -3.11 examples/gallery_drive_lateral_env.py

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

spin_from_marker_sequence · carla_transform_matrix · carla_pose_to_world · carla_camera_pose · carla_xy_yaw · carla_scene_load · town_chain · osm_parse

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.