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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, 04 September 2025 · astronomical night 21:26 → 05:13 (7.79 h) · Moon 90% (waxing gibbous) · weather: ERA5 history

M31M31 22:00–22:50: quality 0.5M31 22:50–23:00: quality 0.6M31 23:00–00:00: quality 0.3M31 00:00–01:00: quality 0.1M31 01:00–02:00: quality 0.2M31 02:00–03:00: quality 0.1M31 04:00–05:00: quality 0.7M31 05:00–05:15: quality 1.0M31 05:15–05:50: quality 0.5M31 05:50–06:25: quality 0.1observe M31 23:20–00:00M42M42 04:15–04:30: quality 0.3M42 04:30–04:55: quality 0.4M42 04:55–05:00: quality 0.5M42 05:00–05:10: quality 0.7M42 05:10–05:15: quality 0.8M42 05:15–05:50: quality 0.4M42 05:50–06:25: quality 0.1observe M42 05:20–05:50M45M45 00:40–01:15: quality 0.1M45 01:15–02:00: quality 0.2M45 02:00–03:00: quality 0.1M45 04:00–05:00: quality 0.7M45 05:00–05:15: quality 1.0M45 05:15–05:50: quality 0.5M45 05:50–06:00: quality 0.1M45 06:00–06:25: quality 0.2observe M45 04:40–05:20NGC 7000NGC 7000 22:00–23:00: quality 0.6NGC 7000 23:00–00:00: quality 0.3NGC 7000 00:00–01:00: quality 0.1NGC 7000 01:00–02:00: quality 0.2NGC 7000 02:00–03:00: quality 0.1NGC 7000 04:00–05:00: quality 0.6NGC 7000 05:00–05:15: quality 0.8NGC 7000 05:15–05:25: quality 0.4NGC 7000 05:25–05:50: quality 0.3NGC 7000 05:50–06:20: quality 0.1observe NGC 7000 22:00–22:40V1057 CygV1057 Cyg 22:00–23:00: quality 0.6V1057 Cyg 23:00–00:00: quality 0.3V1057 Cyg 00:00–01:00: quality 0.1V1057 Cyg 01:00–02:00: quality 0.2V1057 Cyg 02:00–03:00: quality 0.1V1057 Cyg 04:00–05:00: quality 0.6V1057 Cyg 05:00–05:15: quality 0.8V1057 Cyg 05:15–05:25: quality 0.4V1057 Cyg 05:25–05:50: quality 0.3V1057 Cyg 05:50–06:20: quality 0.1observe V1057 Cyg 22:40–23:20M33M33 22:05–22:25: quality 0.3M33 22:25–22:45: quality 0.4M33 22:45–23:00: quality 0.5M33 23:00–00:00: quality 0.3M33 00:00–01:00: quality 0.1M33 01:00–02:00: quality 0.2M33 02:00–03:00: quality 0.1M33 04:00–05:00: quality 0.7M33 05:00–05:15: quality 1.0M33 05:15–05:50: quality 0.5M33 05:50–06:00: quality 0.1M33 06:00–06:20: quality 0.2M33 06:20–06:25: quality 0.1observe M33 04:00–04:40scheduleNGC 7000V1057 CygM31M33M4520:0022:0000:0002:0004:0006:00

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
19:45–22:00 — nothing worth pointing at — 2.25
22:00–22:40 NGC 7000 0.67 0.55
22:40–23:20 V1057 Cyg 0.67 0.43
23:20–00:00 M31 0.67 0.32
00:00–04:00 — nothing worth pointing at — 4.0
04:00–04:40 M33 0.67 0.69
04:40–05:20 M45 0.67 0.78
05:20–05:50 M42 0.5 0.4
05:50–06:55 — nothing worth pointing at — 1.08

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 40 04:00–05:15 (good) 89.5° at 03:10 84.8° 0.67
M42 Great Orion Nebula 17 15 05:00–05:15 (good) 42.9° at 08:00 127.3° 0.5
M45 Seven Sisters 100 40 04:00–05:15 (good) 72.5° at 06:10 113.5° 0.67
NGC 7000 North America Nebula 89 34 05:00–05:15 (good) 87.3° at 23:25 66.6° 0.67
V1057 Cyg 89 34 05:00–05:15 (good) 87.3° at 23:25 66.5° 0.67
M33 Triangulum Pinwheel 100 42 04:00–05:15 (good) 79.1° at 04:00 88.1° 0.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-04"

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"}.