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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, 10 January 2026 · astronomical night 18:48 → 06:08 (11.32 h) · Moon 47% (last quarter) · weather: ERA5 history

M31M31 21:00–21:25: quality 0.9M31 21:25–22:00: quality 0.8M31 22:00–22:20: quality 0.6M31 22:20–23:00: quality 0.5M31 23:00–00:25: quality 0.2observe M31 22:00–23:00M42M42 21:00–22:00: quality 0.8M42 22:00–23:00: quality 0.6M42 23:00–00:00: quality 0.2M42 00:00–00:50: quality 0.4M42 00:50–01:00: quality 0.3M42 01:00–01:15: quality 0.4M42 01:15–01:55: quality 0.3M42 01:55–02:00: quality 0.2M42 02:00–02:20: quality 0.3M42 02:20–02:25: quality 0.2observe M42 01:00–01:35observe M42 02:00–02:10M45M45 21:00–22:00: quality 0.9M45 22:00–23:00: quality 0.6M45 23:00–23:40: quality 0.3M45 23:40–00:00: quality 0.2M45 00:00–01:15: quality 0.4M45 01:15–02:25: quality 0.3observe M45 00:00–01:00observe M45 01:35–01:45NGC 7000V1057 CygM33M33 21:00–21:50: quality 0.9M33 21:50–22:00: quality 0.8M33 22:00–22:45: quality 0.6M33 22:45–23:00: quality 0.5M33 23:00–00:00: quality 0.2M33 00:00–00:10: quality 0.3M33 00:10–00:35: quality 0.2observe M33 21:00–22:00scheduleM33M31M4518:0020:0022:0000:0002:0004:0006:00

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
17:05–21:00 — nothing worth pointing at — 3.92
21:00–22:00 M33 1.0 0.87
22:00–23:00 M31 1.0 0.54
23:00–00:00 — nothing worth pointing at — 1.0
00:00–01:00 M45 1.0 0.37
01:00–01:35 M42 0.58 0.34
01:35–01:45 M45 0.17 0.31
01:45–02:00 — nothing worth pointing at — 0.25
02:00–02:10 M42 0.17 0.32
02:10–07:50 — nothing worth pointing at — 5.67

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 32 21:00–22:00 (good) 89.7° at 17:45 149.9° 1.0
M42 Great Orion Nebula 89 36 21:00–22:00 (good) 42.9° at 22:35 114.8° 0.75
M45 Seven Sisters 100 36 21:00–23:00 (good) 72.5° at 20:50 144.1° 1.17
NGC 7000 North America Nebula 38 0 — 87.3° at 14:00 115.8° 0.0
V1057 Cyg 38 0 — 87.3° at 14:00 115.9° 0.0
M33 Triangulum Pinwheel 100 33 21:00–22:00 (good) 79.1° at 18:35 161.7° 1.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-01-10"

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"}.