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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, 10 December 2025 · astronomical night 18:30 → 05:57 (11.46 h) · Moon 60% (waning gibbous) · weather: ERA5 history

M31M31 19:00–20:00: quality 0.1M31 23:00–23:15: quality 0.4M31 23:15–00:00: quality 0.3M31 00:00–01:00: quality 0.4M31 01:00–02:00: quality 0.1M31 02:00–02:25: quality 0.2M31 02:25–02:30: quality 0.1observe M31 00:00–01:00M42M42 23:00–01:00: quality 0.3M42 01:00–02:00: quality 0.1M42 02:00–03:00: quality 0.3M42 03:00–03:45: quality 0.5M42 03:45–04:05: quality 0.4M42 04:05–04:30: quality 0.3observe M42 03:30–04:15M45M45 19:00–20:00: quality 0.1M45 23:00–23:15: quality 0.4M45 23:15–00:00: quality 0.3M45 00:00–01:00: quality 0.4M45 01:00–01:55: quality 0.2M45 01:55–02:00: quality 0.1M45 02:00–03:00: quality 0.3M45 03:00–03:40: quality 0.6M45 03:40–03:55: quality 0.5M45 03:55–04:15: quality 0.4M45 04:15–04:30: quality 0.3observe M45 02:00–02:30observe M45 03:00–03:30observe M45 04:15–04:25NGC 7000NGC 7000 19:00–20:00: quality 0.1V1057 CygV1057 Cyg 19:00–20:00: quality 0.1M33M33 19:00–20:00: quality 0.1M33 23:00–23:20: quality 0.4M33 23:20–00:00: quality 0.3M33 00:00–01:00: quality 0.4M33 01:00–02:00: quality 0.1M33 02:00–02:40: quality 0.2observe M33 23:00–00:00scheduleM33M3118:0020:0022:0000:0002:0004:0006:00

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
16:50–23:00 — nothing worth pointing at — 6.17
23:00–00:00 M33 1.0 0.35
00:00–01:00 M31 1.0 0.37
01:00–02:00 — nothing worth pointing at — 1.0
02:00–02:30 M45 0.5 0.31
02:30–03:00 — nothing worth pointing at — 0.5
03:00–03:30 M45 0.5 0.59
03:30–04:15 M42 0.75 0.41
04:15–04:25 M45 0.17 0.32
04:25–07:40 — nothing worth pointing at — 3.25

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 14 23:00–01:00 (marginal) 89.6° at 19:45 122.4° 1.0
M42 Great Orion Nebula 86 28 03:00–04:15 (marginal) 42.9° at 00:40 77.2° 0.75
M45 Seven Sisters 100 24 03:00–03:10 (good) 72.5° at 22:50 98.3° 1.17
NGC 7000 North America Nebula 100 3 — 87.2° at 16:05 122.1° 0.0
V1057 Cyg 99 3 — 87.3° at 16:05 122.1° 0.0
M33 Triangulum Pinwheel 100 15 23:00–01:00 (marginal) 79.1° at 20:35 122.5° 1.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-10"

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"}.