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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 Friday, 26 September 2031 · astronomical night 20:44 → 05:40 (8.92 h) · Moon 81% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:40–20:15: quality 0.1M31 20:15–20:45: quality 0.3M31 20:45–22:05: quality 0.6M31 22:05–01:20: quality 0.7M31 01:20–03:10: quality 0.8M31 03:10–05:10: quality 1.0M31 05:10–05:45: quality 0.9M31 05:45–05:50: quality 0.5M31 05:50–06:15: quality 0.4M31 06:15–06:50: quality 0.1observe M31 22:00–23:45M42M42 02:50–03:00: quality 0.4M42 03:00–03:15: quality 0.5M42 03:15–03:30: quality 0.6M42 03:30–03:45: quality 0.7M42 03:45–04:55: quality 0.8M42 04:55–05:45: quality 0.9M42 05:45–06:15: quality 0.4M42 06:15–06:50: quality 0.1observe M42 04:40–06:15M45M45 23:15–23:30: quality 0.4M45 23:30–23:45: quality 0.5M45 23:45–00:05: quality 0.6M45 00:05–01:00: quality 0.7M45 01:00–02:20: quality 0.8M45 02:20–03:10: quality 0.9M45 03:10–05:45: quality 1.0M45 05:45–06:15: quality 0.5M45 06:15–06:45: quality 0.2M45 06:45–06:50: quality 0.1observe M45 01:30–03:15NGC 7000NGC 7000 19:40–20:15: quality 0.1NGC 7000 20:15–20:45: quality 0.3NGC 7000 20:45–00:20: quality 0.6NGC 7000 00:20–01:40: quality 0.7NGC 7000 01:40–03:10: quality 0.6NGC 7000 03:10–03:55: quality 0.8NGC 7000 03:55–04:10: quality 0.7NGC 7000 04:10–04:30: quality 0.6NGC 7000 04:30–04:45: quality 0.5NGC 7000 04:45–04:55: quality 0.4observe NGC 7000 20:15–22:00V1057 CygV1057 Cyg 19:40–20:15: quality 0.1V1057 Cyg 20:15–20:45: quality 0.3V1057 Cyg 20:45–00:25: quality 0.6V1057 Cyg 00:25–01:40: quality 0.7V1057 Cyg 01:40–03:10: quality 0.6V1057 Cyg 03:10–03:55: quality 0.8V1057 Cyg 03:55–04:10: quality 0.7V1057 Cyg 04:10–04:30: quality 0.6V1057 Cyg 04:30–04:45: quality 0.5V1057 Cyg 04:45–04:55: quality 0.4observe V1057 Cyg 03:15–04:40M33M33 20:40–20:45: quality 0.2M33 20:45–20:50: quality 0.3M33 20:50–21:10: quality 0.4M33 21:10–21:30: quality 0.5M33 21:30–22:55: quality 0.6M33 22:55–00:35: quality 0.7M33 00:35–03:10: quality 0.8M33 03:10–05:35: quality 1.0M33 05:35–05:45: quality 0.9M33 05:45–06:15: quality 0.5M33 06:15–06:50: quality 0.1observe M33 23:45–01:30scheduleNGC 7000M31M33M45V1057 CygM4220:0022:0000:0002:0004:0006:00

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
19:10–20:15 — nothing worth pointing at — 1.08
20:15–22:00 NGC 7000 1.75 0.53
22:00–23:45 M31 1.75 0.69
23:45–01:30 M33 1.75 0.75
01:30–03:15 M45 1.75 0.86
03:15–04:40 V1057 Cyg 1.42 0.7
04:40–06:15 M42 1.58 0.73
06:15–07:15 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 21:00–05:45 (good) 89.6° at 01:45 75.5° 1.75
M42 Great Orion Nebula 55 unknown 03:20–05:45 (good) 42.9° at 06:35 128.1° 1.58
M45 Seven Sisters 100 unknown 23:55–05:45 (good) 72.5° at 04:45 107.4° 1.75
NGC 7000 North America Nebula 84 unknown 20:45–04:20 (good) 87.2° at 22:00 56.7° 1.75
V1057 Cyg 84 unknown 20:45–04:20 (good) 87.3° at 22:00 56.6° 1.42
M33 Triangulum Pinwheel 100 unknown 22:05–05:45 (good) 79.1° at 02:35 80.2° 1.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2031-09-26"

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"}.