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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, 23 September 2027 · astronomical night 20:50 → 05:36 (8.77 h) · Moon 44% (waning crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:45–20:20: quality 0.1M31 20:20–20:55: quality 0.4M31 20:55–21:10: quality 0.8M31 21:10–22:35: quality 0.9M31 22:35–00:05: quality 1.0M31 00:05–02:05: quality 0.9M31 02:05–05:25: quality 0.8M31 05:25–05:40: quality 0.7M31 05:40–06:10: quality 0.4M31 06:10–06:45: quality 0.1observe M31 23:40–01:20M42M42 03:00–03:15: quality 0.3M42 03:15–03:35: quality 0.4M42 03:35–04:00: quality 0.5M42 04:00–05:40: quality 0.6M42 05:40–06:10: quality 0.3M42 06:10–06:45: quality 0.1observe M42 04:40–05:40M45M45 23:25–23:30: quality 0.4M45 23:30–23:45: quality 0.5M45 23:45–00:00: quality 0.6M45 00:00–00:05: quality 0.7M45 00:05–00:20: quality 0.6M45 00:20–03:00: quality 0.7M45 03:00–03:10: quality 0.8M45 03:10–05:40: quality 0.7M45 05:40–06:10: quality 0.3M45 06:10–06:45: quality 0.1observe M45 03:00–04:40NGC 7000NGC 7000 19:45–20:20: quality 0.2NGC 7000 20:20–20:55: quality 0.5NGC 7000 20:55–00:05: quality 1.0NGC 7000 00:05–02:00: quality 0.9NGC 7000 02:00–03:25: quality 0.8NGC 7000 03:25–04:10: quality 0.7NGC 7000 04:10–04:30: quality 0.6NGC 7000 04:30–04:45: quality 0.5NGC 7000 04:45–05:05: quality 0.4observe NGC 7000 20:20–22:00V1057 CygV1057 Cyg 19:45–20:20: quality 0.2V1057 Cyg 20:20–20:55: quality 0.5V1057 Cyg 20:55–00:05: quality 1.0V1057 Cyg 00:05–02:00: quality 0.9V1057 Cyg 02:00–03:25: quality 0.8V1057 Cyg 03:25–04:10: quality 0.7V1057 Cyg 04:10–04:30: quality 0.6V1057 Cyg 04:30–04:45: quality 0.5V1057 Cyg 04:45–05:05: quality 0.4observe V1057 Cyg 22:00–23:40M33M33 20:50–20:55: quality 0.2M33 20:55–21:10: quality 0.5M33 21:10–21:25: quality 0.6M33 21:25–21:40: quality 0.7M33 21:40–22:30: quality 0.8M33 22:30–23:50: quality 0.9M33 23:50–00:05: quality 1.0M33 00:05–01:25: quality 0.9M33 01:25–05:35: quality 0.8M33 05:35–05:40: quality 0.7M33 05:40–06:10: quality 0.4M33 06:10–06:45: quality 0.1observe M33 01:20–03:00observe M33 05:40–06:10scheduleNGC 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
19:15–20:20 — nothing worth pointing at — 1.08
20:20–22:00 NGC 7000 1.67 0.82
22:00–23:40 V1057 Cyg 1.67 1.0
23:40–01:20 M31 1.67 0.91
01:20–03:00 M33 1.67 0.83
03:00–04:40 M45 1.67 0.73
04:40–05:40 M42 1.0 0.59
05:40–06:10 M33 0.5 0.36
06:10–07:15 — nothing worth pointing at — 1.08

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 20:55–05:40 (good) 89.7° at 01:55 71.2° 1.67
M42 Great Orion Nebula 24 unknown 03:00–05:40 (marginal) 42.9° at 06:45 34.3° 1.0
M45 Seven Sisters 75 unknown 00:10–05:40 (good) 72.5° at 05:00 37.3° 1.67
NGC 7000 North America Nebula 100 unknown 20:55–04:20 (good) 87.2° at 22:10 102.0° 1.67
V1057 Cyg 100 unknown 20:55–04:20 (good) 87.3° at 22:10 102.0° 1.67
M33 Triangulum Pinwheel 97 unknown 21:20–05:40 (good) 79.1° at 02:45 64.4° 2.17
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-23"

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"}.