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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.

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Night of Sunday, 13 September 2026 · astronomical night 21:09 → 05:25 (8.27 h) · Moon 9% (waxing crescent) · weather: ERA5 history

M31M31 19:30–20:05: unusableM31 20:05–20:40: poorM31 20:40–21:10: marginalM31 21:10–05:30: goodM31 05:30–06:00: marginalM31 06:00–06:35: poorM31 06:35–07:05: unusableobserve M31 23:50–01:25M42M42 19:30–03:40: unusableM42 03:40–04:20: marginalM42 04:20–05:30: goodM42 05:30–06:00: marginalM42 06:00–06:35: poorM42 06:35–07:05: unusableobserve M42 04:35–06:00M45M45 19:30–00:05: unusableM45 00:05–00:55: marginalM45 00:55–05:30: goodM45 05:30–06:00: marginalM45 06:00–06:35: poorM45 06:35–07:05: unusableobserve M45 03:00–04:35NGC 7000NGC 7000 19:30–20:05: unusableNGC 7000 20:05–20:40: poorNGC 7000 20:40–21:10: marginalNGC 7000 21:10–05:05: goodNGC 7000 05:05–05:30: marginalNGC 7000 05:30–05:45: poorNGC 7000 05:45–07:05: unusableobserve NGC 7000 20:40–22:15V1057 CygV1057 Cyg 19:30–20:05: unusableV1057 Cyg 20:05–20:40: poorV1057 Cyg 20:40–21:10: marginalV1057 Cyg 21:10–05:05: goodV1057 Cyg 05:05–05:30: marginalV1057 Cyg 05:30–05:45: poorV1057 Cyg 05:45–07:05: unusableobserve V1057 Cyg 22:15–23:50M33M33 19:30–21:30: unusableM33 21:30–22:20: marginalM33 22:20–05:30: goodM33 05:30–06:00: marginalM33 06:00–06:35: poorM33 06:35–07:05: unusableobserve M33 01:25–03:00scheduleNGC 7000V1057 CygM31M33M45M4220:0022:0000:0002:0004:0006:00

Faded bands: each target's own windows (green good, amber marginal, pink poor). Dark blue: the schedule. Grey columns: twilight.

Schedule

localtargethoursmean quality
19:30–20:40 — nothing worth pointing at — 1.17
20:40–22:15 NGC 7000 1.58 0.74
22:15–23:50 V1057 Cyg 1.58 0.79
23:50–01:25 M31 1.58 0.83
01:25–03:00 M33 1.58 0.87
03:00–04:35 M45 1.58 0.93
04:35–06:00 M42 1.42 0.65
06:00–07:05 — nothing worth pointing at — 1.08

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 88 21:10–05:30 (good) 89.6° at 02:35 150.9° 1.58
M42 Great Orion Nebula 33 32 04:20–05:30 (good) 42.9° at 07:25 115.7° 1.42
M45 Seven Sisters 100 91 00:55–05:30 (good) 72.5° at 05:35 145.8° 1.58
NGC 7000 North America Nebula 100 87 21:10–05:05 (good) 87.3° at 22:50 115.8° 1.58
V1057 Cyg 100 87 21:10–05:05 (good) 87.3° at 22:50 115.9° 1.58
M33 Triangulum Pinwheel 100 88 22:20–05:30 (good) 79.1° at 03:25 163.2° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-13"

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"}.