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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, 20 September 2030 · astronomical night 20:55 → 05:33 (8.63 h) · Moon 40% (waning crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:50–20:25: quality 0.1M31 20:25–21:00: quality 0.4M31 21:00–21:20: quality 0.8M31 21:20–22:45: quality 0.9M31 22:45–00:55: quality 1.0M31 00:55–04:30: quality 0.9M31 04:30–05:35: quality 0.8M31 05:35–06:10: quality 0.4M31 06:10–06:40: quality 0.1observe M31 23:45–01:25M42M42 03:10–03:20: quality 0.3M42 03:20–03:40: quality 0.4M42 03:40–04:05: quality 0.5M42 04:05–05:35: quality 0.6M42 05:35–06:10: quality 0.3M42 06:10–06:40: quality 0.1observe M42 04:45–06:10M45M45 23:35–23:45: quality 0.4M45 23:45–23:55: quality 0.5M45 23:55–00:10: quality 0.6M45 00:10–00:25: quality 0.7M45 00:25–00:55: quality 0.8M45 00:55–01:50: quality 0.7M45 01:50–05:25: quality 0.8M45 05:25–05:35: quality 0.7M45 05:35–06:10: quality 0.4M45 06:10–06:40: quality 0.1observe M45 03:05–04:45NGC 7000NGC 7000 19:50–20:25: quality 0.2NGC 7000 20:25–21:00: quality 0.5NGC 7000 21:00–01:05: quality 1.0NGC 7000 01:05–02:30: quality 0.9NGC 7000 02:30–04:00: quality 0.8NGC 7000 04:00–04:25: quality 0.7NGC 7000 04:25–04:40: quality 0.6NGC 7000 04:40–05:00: quality 0.5NGC 7000 05:00–05:15: quality 0.4observe NGC 7000 20:25–22:05V1057 CygV1057 Cyg 19:50–20:25: quality 0.2V1057 Cyg 20:25–21:00: quality 0.5V1057 Cyg 21:00–01:05: quality 1.0V1057 Cyg 01:05–02:30: quality 0.9V1057 Cyg 02:30–04:00: quality 0.8V1057 Cyg 04:00–04:25: quality 0.7V1057 Cyg 04:25–04:40: quality 0.6V1057 Cyg 04:40–05:00: quality 0.5V1057 Cyg 05:00–05:15: quality 0.4observe V1057 Cyg 22:05–23:45M33M33 21:00–21:10: quality 0.4M33 21:10–21:25: quality 0.5M33 21:25–21:35: quality 0.6M33 21:35–21:50: quality 0.7M33 21:50–22:40: quality 0.8M33 22:40–00:00: quality 0.9M33 00:00–00:55: quality 1.0M33 00:55–03:30: quality 0.9M33 03:30–05:35: quality 0.8M33 05:35–06:10: quality 0.4M33 06:10–06:40: quality 0.1observe M33 01:25–03:05scheduleNGC 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
19:20–20:25 — nothing worth pointing at — 1.08
20:25–22:05 NGC 7000 1.67 0.82
22:05–23:45 V1057 Cyg 1.67 1.0
23:45–01:25 M31 1.67 0.97
01:25–03:05 M33 1.67 0.87
03:05–04:45 M45 1.67 0.78
04:45–06:10 M42 1.42 0.49
06:10–07:10 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 21:00–05:35 (good) 89.7° at 02:05 76.6° 1.67
M42 Great Orion Nebula 24 unknown 04:15–05:35 (good) 42.9° at 07:00 30.8° 1.42
M45 Seven Sisters 83 unknown 00:05–05:35 (good) 72.5° at 05:10 40.7° 1.67
NGC 7000 North America Nebula 100 unknown 21:00–04:35 (good) 87.2° at 22:20 108.0° 1.67
V1057 Cyg 100 unknown 21:00–04:35 (good) 87.3° at 22:20 108.1° 1.67
M33 Triangulum Pinwheel 100 unknown 21:30–05:35 (good) 79.1° at 02:55 69.0° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2030-09-20"

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"}.