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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 Sunday, 31 January 2027 · astronomical night 19:10 → 05:58 (10.8 h) · Moon 27% (waning crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 18:05–18:40: quality 0.2M31 18:40–19:15: quality 0.5M31 19:15–19:50: quality 1.0M31 19:50–21:15: quality 0.9M31 21:15–22:10: quality 0.8M31 22:10–22:25: quality 0.7M31 22:25–22:40: quality 0.6M31 22:40–22:55: quality 0.5M31 22:55–23:05: quality 0.4observe M31 18:40–19:50M42M42 18:05–18:40: quality 0.1M42 18:40–19:15: quality 0.4M42 19:15–19:35: quality 0.8M42 19:35–23:00: quality 0.9M42 23:00–00:10: quality 0.8M42 00:10–00:25: quality 0.7M42 00:25–00:40: quality 0.6M42 00:40–00:55: quality 0.5M42 00:55–01:05: quality 0.4observe M42 22:10–01:05M45M45 18:05–18:40: quality 0.2M45 18:40–19:15: quality 0.5M45 19:15–22:10: quality 1.0M45 22:10–23:30: quality 0.9M45 23:30–00:15: quality 0.8M45 00:15–00:30: quality 0.7M45 00:30–00:45: quality 0.6M45 00:45–01:00: quality 0.5M45 01:00–01:05: quality 0.4observe M45 21:00–22:10NGC 7000NGC 7000 18:05–18:40: quality 0.1NGC 7000 18:40–19:15: quality 0.3NGC 7000 19:15–19:25: quality 0.5NGC 7000 19:25–19:35: quality 0.4NGC 7000 05:45–06:00: quality 0.4NGC 7000 06:00–06:10: quality 0.2NGC 7000 06:10–06:35: quality 0.3NGC 7000 06:35–07:05: quality 0.1observe NGC 7000 05:45–06:00observe NGC 7000 06:25–06:35V1057 CygV1057 Cyg 18:05–18:40: quality 0.1V1057 Cyg 18:40–19:15: quality 0.3V1057 Cyg 19:15–19:25: quality 0.5V1057 Cyg 19:25–19:35: quality 0.4V1057 Cyg 05:45–06:00: quality 0.4V1057 Cyg 06:00–06:10: quality 0.2V1057 Cyg 06:10–06:35: quality 0.3V1057 Cyg 06:35–07:05: quality 0.1M33M33 18:05–18:40: quality 0.2M33 18:40–19:15: quality 0.5M33 19:15–20:15: quality 1.0M33 20:15–21:35: quality 0.9M33 21:35–22:25: quality 0.8M33 22:25–22:40: quality 0.7M33 22:40–22:55: quality 0.6M33 22:55–23:10: quality 0.5M33 23:10–23:15: quality 0.4observe M33 19:50–21:00scheduleM31M33M45M4218:0020:0022:0000:0002:0004:0006:00

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
17:30–18:40 — nothing worth pointing at — 1.17
18:40–19:50 M31 1.17 0.73
19:50–21:00 M33 1.17 0.94
21:00–22:10 M45 1.17 0.98
22:10–01:05 M42 2.92 0.75
01:05–05:45 — nothing worth pointing at — 4.67
05:45–06:00 NGC 7000 0.25 0.42
06:00–06:25 — nothing worth pointing at — 0.42
06:25–06:35 NGC 7000 0.17 0.31
06:35–07:35 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 86 unknown 19:15–22:30 (good) 89.5° at 16:25 131.9° 1.17
M42 Great Orion Nebula 89 unknown 19:15–00:35 (good) 42.9° at 21:15 144.0° 2.92
M45 Seven Sisters 100 unknown 19:15–00:35 (good) 72.5° at 19:25 170.0° 1.17
NGC 7000 North America Nebula 9 unknown 19:15–19:35 (marginal) 87.3° at 12:40 94.1° 0.42
V1057 Cyg 9 unknown 19:15–19:35 (marginal) 87.3° at 12:40 94.0° 0.0
M33 Triangulum Pinwheel 93 unknown 19:15–22:45 (good) 79.1° at 17:15 141.7° 1.17

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-01-31"

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"}.