Rozhen Night Plan

Up to ten targets, one night: each gets its good/marginal/poor windows (darkness × altitude × Moon × clouds, as on the single-target page), then the night is handed out five minutes at a time to whichever target is best — with hysteresis, so you get a few solid blocks of at least 30 minutes, not a flicker. Targets that never win a block are listed with the reason.

Try: an autumn deep-sky night · ← previous night · next night →

Night of Tuesday, 19 May 2026 · astronomical night 22:36 → 03:58 (5.37 h) · Moon 14% (waxing crescent) · weather: ERA5 history

Each row is the target's quality through the night, white → amber → green for 0 → 0.3 → 0.6 → 1 (the same thresholds as poor / marginal / good). Dark blue: the schedule. Grey columns: twilight. Download: schedule CSV · targets CSV · JSON

Schedule

local	target	hours	mean quality
20:35–06:00	— nothing worth pointing at —	9.42

Targets

target	astronomy	best window	highest	Moon sep.
M31 Andromeda Galaxy	7	—	89.6° at 10:15	75.2°
M42 Great Orion Nebula	0	—	42.9° at 15:10	37.8°
M45 Seven Sisters	0	—	72.5° at 13:20	42.9°
NGC 7000 North America Nebula	100	—	87.3° at 06:30	103.6°
V1057 Cyg	100	—	87.3° at 06:30	103.7°
M33 Triangulum Pinwheel	0	—	79.1° at 11:05	69.3°

Left out

M31 — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.
M42 — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.
M45 — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.
NGC 7000 — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.
V1057 Cyg — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.
M33 — Overcast (≥80 % cloud) for 8.2 of 8.2 dark hours — the sky is closed whatever the geometry says.

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-05-19"

targets: names or RA Dec, separated by commas, semicolons or newlines, at most ten. The response carries targets[] (score, verdict, best_window, windows, transit, moon_separation), schedule[] (blocks with target, start/end in UTC and local, hours, mean_quality; target: null is idle time), unscheduled[] with a why, forecast_source, warnings[]. Missing targets → 400 {"error", "code": "targets_missing"}; an unreadable date → 400 {"error", "code": "invalid_date"}.