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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, 11 December 2025 · astronomical night 18:30 → 05:58 (11.47 h) · Moon 49% (last quarter) · weather: ERA5 history

M31M31 17:25–18:00: quality 0.2M31 18:00–18:35: quality 0.5M31 18:35–20:00: quality 1.0M31 20:00–21:00: quality 0.9M31 21:00–22:00: quality 0.7M31 22:00–22:55: quality 0.5M31 22:55–23:00: quality 0.4observe M31 19:50–20:45M42M42 20:50–21:20: quality 0.4M42 21:20–21:45: quality 0.5M42 21:45–22:00: quality 0.6M42 22:00–23:00: quality 0.4M42 03:00–04:00: quality 0.1M42 04:00–04:15: quality 0.4M42 04:15–04:25: quality 0.3observe M42 22:35–23:00observe M42 04:00–04:25M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–18:45: quality 0.8M45 18:45–20:00: quality 0.9M45 20:00–20:05: quality 0.8M45 20:05–21:00: quality 0.9M45 21:00–22:00: quality 0.7M45 22:00–23:00: quality 0.5M45 03:00–04:00: quality 0.1M45 04:00–04:20: quality 0.4M45 04:20–04:25: quality 0.3observe M45 21:40–22:35NGC 7000NGC 7000 17:25–18:00: quality 0.2NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–19:30: quality 1.0NGC 7000 19:30–20:00: quality 0.9NGC 7000 20:00–21:00: quality 0.8NGC 7000 21:00–21:55: quality 0.6NGC 7000 21:55–22:00: quality 0.5NGC 7000 22:00–22:30: quality 0.3NGC 7000 22:30–22:55: quality 0.2observe NGC 7000 18:00–18:55V1057 CygV1057 Cyg 17:25–18:00: quality 0.2V1057 Cyg 18:00–18:35: quality 0.5V1057 Cyg 18:35–19:30: quality 1.0V1057 Cyg 19:30–20:00: quality 0.9V1057 Cyg 20:00–21:00: quality 0.8V1057 Cyg 21:00–21:55: quality 0.6V1057 Cyg 21:55–22:00: quality 0.5V1057 Cyg 22:00–22:30: quality 0.3V1057 Cyg 22:30–22:55: quality 0.2observe V1057 Cyg 18:55–19:50M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.5M33 18:35–20:00: quality 1.0M33 20:00–21:00: quality 0.9M33 21:00–22:00: quality 0.7M33 22:00–23:00: quality 0.5observe M33 20:45–21:40scheduleNGC 7000V1057 CygM31M33M4518:0020:0022:0000:0002:0004:0006:00

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
16:50–18:00 — nothing worth pointing at — 1.17
18:00–18:55 NGC 7000 0.92 0.68
18:55–19:50 V1057 Cyg 0.92 0.96
19:50–20:45 M31 0.92 0.92
20:45–21:40 M33 0.92 0.79
21:40–22:35 M45 0.92 0.57
22:35–23:00 M42 0.42 0.39
23:00–04:00 — nothing worth pointing at — 5.0
04:00–04:25 M42 0.42 0.35
04:25–07:40 — nothing worth pointing at — 3.25

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 53 18:35–22:00 (good) 89.5° at 19:40 132.3° 0.92
M42 Great Orion Nebula 88 19 20:50–23:00 (marginal) 42.9° at 00:35 87.8° 0.83
M45 Seven Sisters 100 43 18:35–22:00 (good) 72.5° at 22:45 111.0° 0.92
NGC 7000 North America Nebula 98 84 18:35–21:40 (good) 87.2° at 16:00 122.5° 0.92
V1057 Cyg 98 84 18:35–21:40 (good) 87.3° at 16:00 122.5° 0.92
M33 Triangulum Pinwheel 100 51 18:35–22:00 (good) 79.1° at 20:35 134.4° 0.92
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-11"

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"}.