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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 Thursday, 16 September 2027 · astronomical night 21:03 → 05:28 (8.41 h) · Moon 99% (full moon) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 20:15–20:35: quality 0.1M31 20:35–21:05: quality 0.2M31 21:05–00:15: quality 0.4M31 00:15–03:35: quality 0.3M31 03:35–05:30: quality 0.4M31 05:30–06:05: quality 0.2M31 06:05–06:40: quality 0.1observe M31 23:35–01:05M42M42 03:30–03:55: quality 0.3M42 03:55–04:15: quality 0.4M42 04:15–05:05: quality 0.5M42 05:05–05:30: quality 0.6M42 05:30–06:05: quality 0.3M42 06:05–06:40: quality 0.1observe M42 04:10–05:30observe M42 06:00–06:05M45M45 23:55–00:10: quality 0.2M45 00:10–00:45: quality 0.3M45 00:45–03:20: quality 0.4M45 03:20–05:30: quality 0.5M45 05:30–06:05: quality 0.3M45 06:05–06:40: quality 0.1observe M45 01:05–02:40NGC 7000NGC 7000 20:00–20:35: quality 0.1NGC 7000 20:35–21:05: quality 0.3NGC 7000 21:05–22:15: quality 0.6NGC 7000 22:15–01:40: quality 0.5NGC 7000 01:40–04:45: quality 0.4NGC 7000 04:45–05:20: quality 0.3NGC 7000 05:20–05:30: quality 0.2NGC 7000 05:30–05:35: quality 0.1observe NGC 7000 20:35–22:05V1057 CygV1057 Cyg 20:00–20:35: quality 0.1V1057 Cyg 20:35–21:05: quality 0.3V1057 Cyg 21:05–22:15: quality 0.6V1057 Cyg 22:15–01:40: quality 0.5V1057 Cyg 01:40–04:45: quality 0.4V1057 Cyg 04:45–05:20: quality 0.3V1057 Cyg 05:20–05:30: quality 0.2V1057 Cyg 05:30–05:35: quality 0.1observe V1057 Cyg 22:05–23:35M33M33 21:20–21:40: quality 0.2M33 21:40–04:20: quality 0.3M33 04:20–05:30: quality 0.4M33 05:30–06:05: quality 0.2M33 06:05–06:40: quality 0.1observe M33 02:40–04:10scheduleNGC 7000V1057 CygM31M45M33M4220:0022:0000:0002:0004:0006:00

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
19:25–20:35 — nothing worth pointing at — 1.17
20:35–22:05 NGC 7000 1.5 0.49
22:05–23:35 V1057 Cyg 1.5 0.52
23:35–01:05 M31 1.5 0.35
01:05–02:40 M45 1.58 0.39
02:40–04:10 M33 1.5 0.32
04:10–05:30 M42 1.33 0.52
05:30–06:00 — nothing worth pointing at — 0.5
06:00–06:05 M42 0.08 0.3
06:05–07:05 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 35 unknown 21:05–05:30 (marginal) 89.5° at 02:25 36.2° 1.5
M42 Great Orion Nebula 16 unknown 03:40–05:30 (marginal) 42.9° at 07:15 81.7° 1.42
M45 Seven Sisters 34 unknown 00:25–05:30 (marginal) 72.5° at 05:25 54.8° 1.58
NGC 7000 North America Nebula 61 unknown 21:05–21:15 (good) 87.2° at 22:40 56.9° 1.5
V1057 Cyg 61 unknown 21:05–21:15 (good) 87.3° at 22:40 56.9° 1.5
M33 Triangulum Pinwheel 28 unknown 22:00–01:15 (marginal) 79.1° at 03:15 31.6° 1.5
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-16"

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"}.