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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, 13 September 2025 · astronomical night 21:08 → 05:25 (8.28 h) · Moon 56% (waning gibbous) · weather: ERA5 history

M31M31 20:15–20:35: quality 0.1M31 20:35–21:00: quality 0.2M31 21:00–21:10: quality 0.3M31 21:10–22:00: quality 0.6M31 22:00–22:05: quality 0.8M31 22:05–22:50: quality 0.9M31 22:50–23:00: quality 0.7M31 23:00–01:15: quality 0.8M31 01:15–05:20: quality 0.7M31 05:20–05:30: quality 0.6M31 05:30–06:00: quality 0.3M31 06:00–06:35: quality 0.1observe M31 23:45–01:20observe M31 05:30–06:00M42M42 03:40–04:05: quality 0.3M42 04:05–04:35: quality 0.4M42 04:35–05:30: quality 0.5M42 05:30–05:55: quality 0.2M42 05:55–06:00: quality 0.3M42 06:00–06:35: quality 0.1observe M42 04:30–05:30M45M45 00:00–00:15: quality 0.3M45 00:15–00:35: quality 0.4M45 00:35–00:55: quality 0.5M45 00:55–05:30: quality 0.6M45 05:30–06:00: quality 0.3M45 06:00–06:35: quality 0.1observe M45 02:55–04:30NGC 7000NGC 7000 20:05–20:35: quality 0.1NGC 7000 20:35–21:10: quality 0.3NGC 7000 21:10–22:00: quality 0.7NGC 7000 22:00–22:50: quality 1.0NGC 7000 22:50–01:15: quality 0.9NGC 7000 01:15–02:45: quality 0.8NGC 7000 02:45–04:25: quality 0.7NGC 7000 04:25–04:55: quality 0.6NGC 7000 04:55–05:15: quality 0.5NGC 7000 05:15–05:30: quality 0.4NGC 7000 05:30–05:45: quality 0.2observe NGC 7000 20:35–22:10V1057 CygV1057 Cyg 20:05–20:35: quality 0.1V1057 Cyg 20:35–21:10: quality 0.3V1057 Cyg 21:10–22:00: quality 0.7V1057 Cyg 22:00–22:50: quality 1.0V1057 Cyg 22:50–01:15: quality 0.9V1057 Cyg 01:15–02:45: quality 0.8V1057 Cyg 02:45–04:25: quality 0.7V1057 Cyg 04:25–04:55: quality 0.6V1057 Cyg 04:55–05:15: quality 0.5V1057 Cyg 05:15–05:30: quality 0.4V1057 Cyg 05:30–05:45: quality 0.2observe V1057 Cyg 22:10–23:45M33M33 21:25–21:45: quality 0.3M33 21:45–22:00: quality 0.4M33 22:00–22:05: quality 0.6M33 22:05–22:20: quality 0.7M33 22:20–22:50: quality 0.8M33 22:50–03:30: quality 0.7M33 03:30–05:30: quality 0.6M33 05:30–06:00: quality 0.3M33 06:00–06:35: quality 0.1observe M33 01:20–02:55scheduleNGC 7000V1057 CygM31M33M45M4220:0022:0000:0002:0004:0006:00

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
19:30–20:35 — nothing worth pointing at — 1.08
20:35–22:10 NGC 7000 1.58 0.58
22:10–23:45 V1057 Cyg 1.58 0.92
23:45–01:20 M31 1.58 0.77
01:20–02:55 M33 1.58 0.69
02:55–04:30 M45 1.58 0.6
04:30–05:30 M42 1.0 0.48
05:30–06:00 M31 0.5 0.31
06:00–07:05 — nothing worth pointing at — 1.08

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 92 87 22:00–05:30 (good) 89.5° at 02:30 51.7° 2.08
M42 Great Orion Nebula 12 12 03:50–05:30 (marginal) 42.9° at 07:25 34.9° 1.0
M45 Seven Sisters 49 49 03:35–03:45 (good) 72.5° at 05:35 14.9° 1.58
NGC 7000 North America Nebula 100 94 21:10–04:45 (good) 87.2° at 22:50 88.3° 1.58
V1057 Cyg 100 94 21:10–04:45 (good) 87.3° at 22:50 88.4° 1.58
M33 Triangulum Pinwheel 83 81 22:00–05:30 (good) 79.1° at 03:25 42.7° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-13"

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"}.