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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, 27 September 2031 · astronomical night 20:43 → 05:41 (8.97 h) · Moon 89% (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 20:45–21:55: quality 0.5M31 21:55–01:55: quality 0.6M31 01:55–04:20: quality 0.7M31 04:20–05:05: quality 1.0M31 05:05–05:45: quality 0.9M31 05:45–06:15: quality 0.4M31 06:15–06:50: quality 0.1observe M31 22:25–00:05M42M42 02:45–03:00: quality 0.4M42 03:00–03:20: quality 0.5M42 03:20–03:35: quality 0.6M42 03:35–04:15: quality 0.7M42 04:15–04:50: quality 0.8M42 04:50–05:45: quality 0.9M42 05:45–06:15: quality 0.4M42 06:15–06:50: quality 0.1observe M42 04:35–06:15M45M45 23:10–23:20: quality 0.3M45 23:20–23:35: quality 0.4M45 23:35–23:55: quality 0.5M45 23:55–00:50: quality 0.6M45 00:50–02:10: quality 0.7M45 02:10–04:20: quality 0.8M45 04:20–05:45: 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 01:45–03:25NGC 7000NGC 7000 19:40–20:15: quality 0.1NGC 7000 20:15–20:45: quality 0.3NGC 7000 20:45–21:30: quality 0.6NGC 7000 21:30–00:00: quality 0.5NGC 7000 00:00–03:00: quality 0.6NGC 7000 03:00–04:10: quality 0.5NGC 7000 04:10–04:20: quality 0.4NGC 7000 04:20–04:25: quality 0.6NGC 7000 04:25–04:40: quality 0.5NGC 7000 04:40–04:50: quality 0.4observe NGC 7000 20:45–22:25V1057 CygV1057 Cyg 19:40–20:15: quality 0.1V1057 Cyg 20:15–20:45: quality 0.3V1057 Cyg 20:45–21:25: quality 0.6V1057 Cyg 21:25–00:00: quality 0.5V1057 Cyg 00:00–02:55: quality 0.6V1057 Cyg 02:55–04:10: quality 0.5V1057 Cyg 04:10–04:20: quality 0.4V1057 Cyg 04:20–04:25: quality 0.6V1057 Cyg 04:25–04:40: quality 0.5V1057 Cyg 04:40–04:50: quality 0.4observe V1057 Cyg 03:25–04:35M33M33 20:35–20:45: quality 0.1M33 20:45–21:00: quality 0.3M33 21:00–21:20: quality 0.4M33 21:20–22:55: quality 0.5M33 22:55–01:30: quality 0.6M33 01:30–04:10: quality 0.7M33 04:10–04:20: quality 0.8M33 04:20–05:35: 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 00:05–01:45scheduleNGC 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
19:10–20:45 — nothing worth pointing at — 1.58
20:45–22:25 NGC 7000 1.67 0.55
22:25–00:05 M31 1.67 0.59
00:05–01:45 M33 1.67 0.64
01:45–03:25 M45 1.67 0.78
03:25–04:35 V1057 Cyg 1.17 0.51
04:35–06:15 M42 1.67 0.73
06:15–07:15 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 23:55–05:45 (good) 89.7° at 01:40 63.5° 1.67
M42 Great Orion Nebula 54 unknown 03:25–05:45 (good) 42.9° at 06:30 115.7° 1.67
M45 Seven Sisters 100 unknown 00:05–05:45 (good) 72.5° at 04:45 93.0° 1.67
NGC 7000 North America Nebula 57 unknown 20:45–04:50 (marginal) 87.2° at 21:55 53.4° 1.67
V1057 Cyg 57 unknown 20:45–04:50 (marginal) 87.3° at 21:55 53.3° 1.17
M33 Triangulum Pinwheel 100 unknown 23:55–05:45 (good) 79.1° at 02:30 66.5° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2031-09-27"

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"}.