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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 Tuesday, 15 September 2026 · astronomical night 21:05 → 05:27 (8.37 h) · Moon 23% (waxing crescent) · weather: ERA5 history

M31M31 19:30–20:00: unusableM31 20:00–21:10: poorM31 21:10–22:00: marginalM31 22:00–23:00: goodM31 23:00–23:15: marginalM31 23:15–05:30: goodM31 05:30–06:05: marginalM31 06:05–06:35: poorM31 06:35–07:05: unusableobserve M31 00:10–01:40M42M42 19:30–03:30: unusableM42 03:30–04:05: marginalM42 04:05–05:30: goodM42 05:30–06:05: marginalM42 06:05–06:35: poorM42 06:35–07:05: unusableobserve M42 04:40–06:05M45M45 19:30–23:55: unusableM45 23:55–00:10: poorM45 00:10–01:35: marginalM45 01:35–05:30: goodM45 05:30–06:05: marginalM45 06:05–06:35: poorM45 06:35–07:05: unusableobserve M45 03:10–04:40NGC 7000NGC 7000 19:30–20:00: unusableNGC 7000 20:00–21:10: poorNGC 7000 21:10–22:00: marginalNGC 7000 22:00–05:00: goodNGC 7000 05:00–05:30: marginalNGC 7000 05:30–05:35: poorNGC 7000 05:35–07:05: unusableobserve NGC 7000 21:10–22:40V1057 CygV1057 Cyg 19:30–20:00: unusableV1057 Cyg 20:00–21:10: poorV1057 Cyg 21:10–22:00: marginalV1057 Cyg 22:00–05:00: goodV1057 Cyg 05:00–05:30: marginalV1057 Cyg 05:30–05:35: poorV1057 Cyg 05:35–07:05: unusableobserve V1057 Cyg 22:40–00:10M33M33 19:30–21:20: unusableM33 21:20–21:50: poorM33 21:50–22:20: marginalM33 22:20–23:00: goodM33 23:00–00:45: marginalM33 00:45–05:30: goodM33 05:30–06:05: marginalM33 06:05–06:35: poorM33 06:35–07:05: unusableobserve M33 01:40–03:10scheduleNGC 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
19:30–21:10 — nothing worth pointing at — 1.67
21:10–22:40 NGC 7000 1.5 0.61
22:40–00:10 V1057 Cyg 1.5 0.65
00:10–01:40 M31 1.5 0.65
01:40–03:10 M33 1.5 0.76
03:10–04:40 M45 1.5 0.98
04:40–06:05 M42 1.42 0.66
06:05–07:05 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 75 23:15–05:30 (good) 89.7° at 02:25 144.7° 1.5
M42 Great Orion Nebula 36 36 04:05–05:30 (good) 42.9° at 07:15 134.0° 1.42
M45 Seven Sisters 100 85 01:35–05:30 (good) 72.5° at 05:30 170.8° 1.5
NGC 7000 North America Nebula 100 72 22:00–05:00 (good) 87.2° at 22:40 104.4° 1.5
V1057 Cyg 100 72 22:00–05:00 (good) 87.3° at 22:40 104.4° 1.5
M33 Triangulum Pinwheel 100 79 00:45–05:30 (good) 79.1° at 03:15 157.9° 1.5
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-15"

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"}.