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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 Wednesday, 16 December 2026 · astronomical night 18:31 → 06:01 (11.5 h) · Moon 47% (waxing crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:25–18:00: quality 0.1M31 18:00–18:35: quality 0.4M31 18:35–20:30: quality 0.7M31 20:30–23:20: quality 0.8M31 23:20–23:55: quality 0.7M31 23:55–00:15: quality 0.9M31 00:15–01:10: quality 0.8M31 01:10–01:25: quality 0.7M31 01:25–01:40: quality 0.6M31 01:40–01:55: quality 0.5M31 01:55–02:05: quality 0.4observe M31 01:00–01:55M42M42 20:30–20:50: quality 0.4M42 20:50–21:05: quality 0.5M42 21:05–21:25: quality 0.6M42 21:25–22:20: quality 0.7M42 22:20–23:55: quality 0.8M42 23:55–02:00: quality 0.9M42 02:00–03:10: quality 0.8M42 03:10–03:25: quality 0.7M42 03:25–03:40: quality 0.6M42 03:40–04:00: quality 0.5M42 04:00–04:05: quality 0.4observe M42 01:55–04:05M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.3M45 18:35–19:40: quality 0.7M45 19:40–22:45: quality 0.8M45 22:45–23:55: quality 0.9M45 23:55–01:10: quality 1.0M45 01:10–02:30: quality 0.9M45 02:30–03:20: quality 0.8M45 03:20–03:30: quality 0.7M45 03:30–03:45: quality 0.6M45 03:45–04:00: quality 0.5M45 04:00–04:05: quality 0.4observe M45 21:30–23:15NGC 7000NGC 7000 17:25–18:00: quality 0.1NGC 7000 18:00–18:35: quality 0.4NGC 7000 18:35–21:00: quality 0.7NGC 7000 21:00–21:45: quality 0.6NGC 7000 21:45–22:05: quality 0.5NGC 7000 22:05–22:30: quality 0.4NGC 7000 22:30–22:35: quality 0.3observe NGC 7000 18:00–19:45V1057 CygV1057 Cyg 17:25–18:00: quality 0.1V1057 Cyg 18:00–18:35: quality 0.4V1057 Cyg 18:35–21:00: quality 0.7V1057 Cyg 21:00–21:45: quality 0.6V1057 Cyg 21:45–22:05: quality 0.5V1057 Cyg 22:05–22:30: quality 0.4V1057 Cyg 22:30–22:35: quality 0.3observe V1057 Cyg 19:45–21:30M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.4M33 18:35–20:45: quality 0.7M33 20:45–23:55: quality 0.8M33 23:55–00:40: quality 0.9M33 00:40–01:25: quality 0.8M33 01:25–01:40: quality 0.7M33 01:40–01:55: quality 0.6M33 01:55–02:10: quality 0.5M33 02:10–02:15: quality 0.4observe M33 23:15–01:00scheduleNGC 7000V1057 CygM45M33M31M4218:0020:0022:0000:0002:0004:0006:00

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
18:00–19:45 NGC 7000 1.75 0.61
19:45–21:30 V1057 Cyg 1.75 0.66
21:30–23:15 M45 1.75 0.84
23:15–01:00 M33 1.75 0.83
01:00–01:55 M31 0.92 0.63
01:55–04:05 M42 2.17 0.72
04:05–07:45 — nothing worth pointing at — 3.67

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 87 unknown 18:35–01:30 (good) 89.6° at 19:25 46.0° 0.92
M42 Great Orion Nebula 89 unknown 21:15–03:35 (good) 42.9° at 00:15 92.6° 2.17
M45 Seven Sisters 100 unknown 18:35–03:40 (good) 72.5° at 22:25 68.3° 1.75
NGC 7000 North America Nebula 52 unknown 18:35–21:35 (good) 87.3° at 15:40 55.8° 1.75
V1057 Cyg 52 unknown 18:35–21:35 (good) 87.3° at 15:40 55.7° 1.75
M33 Triangulum Pinwheel 90 unknown 18:35–01:45 (good) 79.1° at 20:15 44.3° 1.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-12-16"

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"}.