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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 Saturday, 11 September 2027 · astronomical night 21:13 → 05:22 (8.15 h) · Moon 86% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 20:10–20:40: quality 0.1M31 20:40–20:50: quality 0.2M31 20:50–21:15: quality 0.3M31 21:15–22:20: quality 0.6M31 22:20–00:00: quality 0.7M31 00:00–03:15: quality 0.8M31 03:15–05:25: quality 1.0M31 05:25–06:00: quality 0.5M31 06:00–06:30: quality 0.1observe M31 23:50–01:25M42M42 03:50–03:55: quality 0.4M42 03:55–04:10: quality 0.5M42 04:10–04:30: quality 0.6M42 04:30–04:45: quality 0.7M42 04:45–05:25: quality 0.8M42 05:25–06:00: quality 0.4M42 06:00–06:30: quality 0.1observe M42 04:35–06:00M45M45 00:10–00:25: quality 0.4M45 00:25–00:40: quality 0.5M45 00:40–00:55: quality 0.6M45 00:55–01:35: quality 0.7M45 01:35–02:55: quality 0.8M45 02:55–03:15: quality 0.9M45 03:15–05:25: quality 1.0M45 05:25–06:00: quality 0.5M45 06:00–06:30: quality 0.2observe M45 03:00–04:35NGC 7000NGC 7000 20:10–20:40: quality 0.1NGC 7000 20:40–21:15: quality 0.3NGC 7000 21:15–03:15: quality 0.7NGC 7000 03:15–04:00: quality 0.9NGC 7000 04:00–04:55: quality 0.8NGC 7000 04:55–05:10: quality 0.7NGC 7000 05:10–05:25: quality 0.6NGC 7000 05:25–05:35: quality 0.3NGC 7000 05:35–05:55: quality 0.2observe NGC 7000 20:40–22:15V1057 CygV1057 Cyg 20:10–20:40: quality 0.1V1057 Cyg 20:40–21:15: quality 0.3V1057 Cyg 21:15–03:15: quality 0.7V1057 Cyg 03:15–04:00: quality 0.9V1057 Cyg 04:00–04:55: quality 0.8V1057 Cyg 04:55–05:10: quality 0.7V1057 Cyg 05:10–05:25: quality 0.6V1057 Cyg 05:25–05:35: quality 0.3V1057 Cyg 05:35–05:55: quality 0.2observe V1057 Cyg 22:15–23:50M33M33 21:35–21:45: quality 0.3M33 21:45–22:05: quality 0.4M33 22:05–22:25: quality 0.5M33 22:25–23:15: quality 0.6M33 23:15–00:45: quality 0.7M33 00:45–03:15: quality 0.8M33 03:15–05:25: quality 1.0M33 05:25–06:00: quality 0.5M33 06:00–06:30: quality 0.1observe M33 01:25–03:00scheduleNGC 7000V1057 CygM31M33M45M4220:0022:0000:0002:0004:0006:00

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

localtargethoursmean quality
19:35–20:40 — nothing worth pointing at — 1.08
20:40–22:15 NGC 7000 1.58 0.54
22:15–23:50 V1057 Cyg 1.58 0.65
23:50–01:25 M31 1.58 0.76
01:25–03:00 M33 1.58 0.81
03:00–04:35 M45 1.58 0.97
04:35–06:00 M42 1.42 0.64
06:00–07:00 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 21:15–05:25 (good) 89.5° at 02:40 84.7° 1.58
M42 Great Orion Nebula 29 unknown 04:20–05:25 (good) 42.9° at 07:35 130.6° 1.42
M45 Seven Sisters 100 unknown 00:50–05:25 (good) 72.5° at 05:45 115.1° 1.58
NGC 7000 North America Nebula 89 unknown 21:15–05:20 (good) 87.2° at 23:00 64.4° 1.58
V1057 Cyg 89 unknown 21:15–05:20 (good) 87.3° at 23:00 64.3° 1.58
M33 Triangulum Pinwheel 100 unknown 22:30–05:25 (good) 79.1° at 03:35 88.9° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-11"

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"}.