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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 Saturday, 27 December 2025 · astronomical night 18:37 → 06:07 (11.49 h) · Moon 51% (first quarter) · weather: ERA5 history

M31M31 17:30–18:05: quality 0.1M31 18:05–18:40: quality 0.3M31 18:40–23:35: quality 0.7M31 23:35–00:35: quality 0.6M31 00:35–00:40: quality 0.5M31 00:40–00:55: quality 0.6M31 00:55–01:15: quality 0.5M31 01:15–01:20: quality 0.4M42M42 19:45–19:50: quality 0.3M42 19:50–20:10: quality 0.4M42 20:10–20:30: quality 0.5M42 20:30–20:55: quality 0.6M42 20:55–23:05: quality 0.7M42 23:05–00:40: quality 0.8M42 00:40–01:15: quality 0.9M42 01:15–02:25: quality 0.8M42 02:25–02:40: quality 0.7M42 02:40–03:00: quality 0.6M42 03:00–03:15: quality 0.5M42 03:15–03:20: quality 0.4observe M42 22:50–00:25M45M45 17:30–18:05: quality 0.1M45 18:05–18:40: quality 0.3M45 18:40–21:45: quality 0.7M45 21:45–00:40: quality 0.8M45 00:40–01:45: quality 0.9M45 01:45–02:35: quality 0.8M45 02:35–02:45: quality 0.7M45 02:45–03:00: quality 0.6M45 03:00–03:15: quality 0.5M45 03:15–03:20: quality 0.4observe M45 21:15–22:50observe M45 01:30–03:20NGC 7000NGC 7000 17:30–18:05: quality 0.1NGC 7000 18:05–18:20: quality 0.4NGC 7000 18:20–18:40: quality 0.3NGC 7000 18:40–19:25: quality 0.7NGC 7000 19:25–20:55: quality 0.6NGC 7000 20:55–21:15: quality 0.5NGC 7000 21:15–21:40: quality 0.4NGC 7000 21:40–21:50: quality 0.3observe NGC 7000 18:05–19:40V1057 CygV1057 Cyg 17:30–18:05: quality 0.1V1057 Cyg 18:05–18:20: quality 0.4V1057 Cyg 18:20–18:40: quality 0.3V1057 Cyg 18:40–19:25: quality 0.7V1057 Cyg 19:25–20:55: quality 0.6V1057 Cyg 20:55–21:15: quality 0.5V1057 Cyg 21:15–21:40: quality 0.4V1057 Cyg 21:40–21:50: quality 0.3observe V1057 Cyg 19:40–21:15M33M33 17:30–18:05: quality 0.1M33 18:05–18:40: quality 0.3M33 18:40–20:05: quality 0.6M33 20:05–23:55: quality 0.7M33 23:55–00:40: quality 0.6M33 00:40–00:55: quality 0.7M33 00:55–01:10: quality 0.6M33 01:10–01:25: quality 0.5M33 01:25–01:30: quality 0.4observe M33 00:25–01:30scheduleNGC 7000V1057 CygM45M42M33M4518:0020:0022:0000:0002:0004:0006:00

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
16:55–18:05 — nothing worth pointing at — 1.17
18:05–19:40 NGC 7000 1.58 0.55
19:40–21:15 V1057 Cyg 1.58 0.59
21:15–22:50 M45 1.58 0.76
22:50–00:25 M42 1.58 0.76
00:25–01:30 M33 1.08 0.6
01:30–03:20 M45 1.83 0.72
03:20–07:50 — nothing worth pointing at — 4.5

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 70 70 18:40–00:25 (good) 89.7° at 18:40 36.1° 0.0
M42 Great Orion Nebula 87 87 20:40–02:50 (good) 42.9° at 23:30 77.9° 1.58
M45 Seven Sisters 93 93 18:40–02:55 (good) 72.5° at 21:45 51.6° 3.42
NGC 7000 North America Nebula 35 35 18:40–20:45 (good) 87.3° at 14:55 59.7° 1.58
V1057 Cyg 35 35 18:40–20:45 (good) 87.3° at 14:55 59.6° 1.58
M33 Triangulum Pinwheel 74 74 18:40–01:05 (good) 79.1° at 19:30 29.9° 1.08

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-27"

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"}.