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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 Friday, 12 September 2025 · astronomical night 21:10 → 05:24 (8.23 h) · Moon 67% (waning gibbous) · weather: ERA5 history

M31M31 20:05–20:40: quality 0.1M31 20:40–20:45: quality 0.2M31 20:45–21:00: quality 0.3M31 21:00–21:15: quality 0.4M31 21:15–22:00: quality 0.8M31 04:00–05:25: quality 0.5M31 05:25–05:45: quality 0.3M31 05:45–06:00: quality 0.2M31 06:00–06:35: quality 0.1observe M31 21:50–22:00observe M31 04:00–04:30M42M42 04:00–04:35: quality 0.3M42 04:35–05:25: quality 0.4M42 05:25–06:00: quality 0.2M42 06:00–06:35: quality 0.1M45M45 04:00–04:20: quality 0.5M45 04:20–05:00: quality 0.4M45 05:00–05:25: quality 0.5M45 05:25–06:00: quality 0.2M45 06:00–06:35: quality 0.1observe M45 05:05–05:25NGC 7000NGC 7000 20:05–20:40: quality 0.1NGC 7000 20:40–21:00: quality 0.4NGC 7000 21:00–21:15: quality 0.5NGC 7000 21:15–22:00: quality 1.0NGC 7000 04:00–04:15: quality 0.6NGC 7000 04:15–05:05: quality 0.5NGC 7000 05:05–05:25: quality 0.4NGC 7000 05:25–05:40: quality 0.2NGC 7000 05:40–05:45: quality 0.1observe NGC 7000 20:40–21:15V1057 CygV1057 Cyg 20:05–20:40: quality 0.1V1057 Cyg 20:40–21:00: quality 0.4V1057 Cyg 21:00–21:15: quality 0.5V1057 Cyg 21:15–22:00: quality 1.0V1057 Cyg 04:00–04:15: quality 0.6V1057 Cyg 04:15–05:05: quality 0.5V1057 Cyg 05:05–05:25: quality 0.4V1057 Cyg 05:25–05:40: quality 0.2V1057 Cyg 05:40–05:45: quality 0.1observe V1057 Cyg 21:15–21:50M33M33 21:30–21:40: quality 0.4M33 21:40–21:55: quality 0.5M33 21:55–22:00: quality 0.6M33 04:00–04:25: quality 0.5M33 04:25–05:00: quality 0.4M33 05:00–05:25: quality 0.5M33 05:25–06:00: quality 0.2M33 06:00–06:35: quality 0.1observe M33 04:30–05:05schedule20:0022:0000:0002:0004:0006:00

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
19:35–20:40 — nothing worth pointing at — 1.08
20:40–21:15 NGC 7000 0.58 0.42
21:15–21:50 V1057 Cyg 0.58 0.96
21:50–22:00 M31 0.17 0.82
22:00–04:00 — nothing worth pointing at — 6.0
04:00–04:30 M31 0.5 0.5
04:30–05:05 M33 0.58 0.45
05:05–05:25 M45 0.33 0.47
05:25–07:00 — nothing worth pointing at — 1.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 86 26 21:15–22:00 (good) 89.6° at 02:35 41.4° 0.67
M42 Great Orion Nebula 8 7 04:15–05:25 (marginal) 42.9° at 07:30 40.1° 0.0
M45 Seven Sisters 33 10 04:00–05:25 (marginal) 72.5° at 05:40 1.1° 0.33
NGC 7000 North America Nebula 100 27 21:15–22:00 (good) 87.2° at 22:50 80.9° 0.58
V1057 Cyg 100 27 21:15–22:00 (good) 87.3° at 22:55 80.9° 0.58
M33 Triangulum Pinwheel 62 15 04:00–05:25 (marginal) 79.1° at 03:25 30.1° 0.58

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-12"

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"}.