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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 September 2025 · astronomical night 21:14 → 05:21 (8.12 h) · Moon 87% (waning gibbous) · weather: ERA5 history

M31M31 22:00–00:00: quality 0.5M31 00:00–01:00: quality 0.3M31 01:00–02:00: quality 0.4M31 02:00–03:00: quality 0.3M31 03:00–04:00: quality 0.2M31 04:00–05:00: quality 0.1observe M31 00:00–00:15observe M31 01:00–01:45M42M42 03:50–04:00: quality 0.1M42 04:10–05:00: quality 0.1M45M45 00:15–00:30: quality 0.1M45 00:30–01:00: quality 0.2M45 01:00–03:00: quality 0.3M45 03:00–04:00: quality 0.2M45 04:00–05:00: quality 0.1observe M45 01:45–02:00NGC 7000NGC 7000 20:45–21:00: quality 0.1NGC 7000 22:00–23:35: quality 0.7NGC 7000 23:35–00:00: quality 0.6NGC 7000 00:00–01:00: quality 0.4NGC 7000 01:00–02:00: quality 0.6NGC 7000 02:00–03:00: quality 0.5NGC 7000 03:00–04:00: quality 0.3NGC 7000 04:00–05:00: quality 0.1observe NGC 7000 22:00–23:00observe NGC 7000 00:15–01:00V1057 CygV1057 Cyg 20:45–21:00: quality 0.1V1057 Cyg 22:00–23:35: quality 0.7V1057 Cyg 23:35–00:00: quality 0.6V1057 Cyg 00:00–01:00: quality 0.4V1057 Cyg 01:00–02:00: quality 0.6V1057 Cyg 02:00–03:00: quality 0.5V1057 Cyg 03:00–04:00: quality 0.3V1057 Cyg 04:00–05:00: quality 0.1observe V1057 Cyg 23:00–00:00M33M33 22:00–22:15: quality 0.3M33 22:15–00:00: quality 0.4M33 00:00–01:00: quality 0.3M33 01:00–02:00: quality 0.4M33 02:00–03:00: quality 0.3M33 03:00–04:00: quality 0.2M33 04:00–05:00: quality 0.1observe M33 02:00–03:00scheduleNGC 7000V1057 CygNGC 7000M31M3320:0022:0000:0002:0004:0006:00

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
19:35–22:00 — nothing worth pointing at — 2.42
22:00–23:00 NGC 7000 1.0 0.67
23:00–00:00 V1057 Cyg 1.0 0.65
00:00–00:15 M31 0.25 0.31
00:15–01:00 NGC 7000 0.75 0.41
01:00–01:45 M31 0.75 0.39
01:45–02:00 M45 0.25 0.32
02:00–03:00 M33 1.0 0.33
03:00–07:00 — nothing worth pointing at — 4.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 47 28 22:00–00:15 (marginal) 89.7° at 02:45 29.9° 1.0
M42 Great Orion Nebula 8 1 — 42.9° at 07:35 59.1° 0.0
M45 Seven Sisters 16 9 01:00–02:00 (marginal) 72.5° at 05:45 28.4° 0.25
NGC 7000 North America Nebula 76 47 22:00–00:00 (good) 87.3° at 23:00 67.4° 1.75
V1057 Cyg 76 47 22:00–00:00 (good) 87.3° at 23:00 67.4° 1.0
M33 Triangulum Pinwheel 34 23 22:00–00:00 (marginal) 79.1° at 03:35 15.9° 1.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-10"

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"}.