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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, 12 December 2025 · astronomical night 18:30 → 05:59 (11.47 h) · Moon 40% (waning crescent) · weather: ERA5 history

M31M31 17:25–18:00: quality 0.2M31 18:00–18:35: quality 0.5M31 18:35–22:00: quality 1.0M31 22:00–22:40: quality 0.9M31 22:40–23:00: quality 0.8M31 23:00–00:00: quality 0.5M31 00:00–01:00: quality 0.2M31 02:00–02:20: quality 0.1observe M31 20:00–21:00M42M42 20:45–20:55: quality 0.4M42 20:55–21:10: quality 0.5M42 21:10–21:25: quality 0.6M42 21:25–21:40: quality 0.7M42 21:40–22:00: quality 0.8M42 22:00–23:00: quality 0.7M42 23:00–23:55: quality 0.4M42 23:55–00:00: quality 0.5M42 00:00–01:00: quality 0.2M42 02:00–03:00: quality 0.2observe M42 23:00–00:00M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–19:00: quality 0.8M45 19:00–20:15: quality 0.9M45 20:15–22:00: quality 1.0M45 22:00–23:00: quality 0.9M45 23:00–00:00: quality 0.5M45 00:00–01:00: quality 0.2M45 02:00–02:30: quality 0.3M45 02:30–03:00: quality 0.2observe M45 21:00–22:00NGC 7000NGC 7000 17:25–18:00: quality 0.2NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–19:15: quality 1.0NGC 7000 19:15–20:45: quality 0.9NGC 7000 20:45–21:50: quality 0.8NGC 7000 21:50–22:00: quality 0.7NGC 7000 22:00–22:10: quality 0.6NGC 7000 22:10–22:30: quality 0.5NGC 7000 22:30–22:50: quality 0.4observe NGC 7000 18:00–19:00V1057 CygV1057 Cyg 17:25–18:00: quality 0.2V1057 Cyg 18:00–18:35: quality 0.5V1057 Cyg 18:35–19:15: quality 1.0V1057 Cyg 19:15–20:45: quality 0.9V1057 Cyg 20:45–21:50: quality 0.8V1057 Cyg 21:50–22:00: quality 0.7V1057 Cyg 22:00–22:10: quality 0.6V1057 Cyg 22:10–22:30: quality 0.5V1057 Cyg 22:30–22:50: quality 0.4observe V1057 Cyg 19:00–20:00M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.5M33 18:35–22:00: quality 1.0M33 22:00–23:00: quality 0.9M33 23:00–00:00: quality 0.5M33 00:00–01:00: quality 0.2M33 02:00–02:15: quality 0.2M33 02:15–02:30: quality 0.1observe M33 22:00–23:00scheduleNGC 7000V1057 CygM31M45M33M4218:0020:0022:0000:0002:0004:0006:00

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
18:00–19:00 NGC 7000 1.0 0.69
19:00–20:00 V1057 Cyg 1.0 0.93
20:00–21:00 M31 1.0 0.99
21:00–22:00 M45 1.0 0.99
22:00–23:00 M33 1.0 0.87
23:00–00:00 M42 1.0 0.45
00:00–07:40 — nothing worth pointing at — 7.67

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 72 18:35–23:00 (good) 89.6° at 19:40 140.8° 1.0
M42 Great Orion Nebula 89 36 21:15–23:00 (good) 42.9° at 00:30 98.1° 1.0
M45 Seven Sisters 100 58 18:35–23:00 (good) 72.5° at 22:40 123.4° 1.0
NGC 7000 North America Nebula 97 94 18:35–22:00 (good) 87.3° at 15:55 121.2° 1.0
V1057 Cyg 97 94 18:35–22:00 (good) 87.3° at 15:55 121.2° 1.0
M33 Triangulum Pinwheel 100 70 18:35–23:00 (good) 79.1° at 20:30 145.7° 1.0
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-12"

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"}.