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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 Tuesday, 09 September 2025 · astronomical night 21:16 → 05:20 (8.06 h) · Moon 94% (waning gibbous) · weather: ERA5 history

M31M31 20:10–20:35: quality 0.1M31 20:45–21:20: quality 0.2M31 21:20–21:55: quality 0.5M31 21:55–22:00: quality 0.4M31 22:00–22:05: quality 0.5M31 22:05–01:20: quality 0.4M31 01:20–04:55: quality 0.3M31 04:55–05:25: quality 0.4M31 05:25–05:55: quality 0.2M31 05:55–06:30: quality 0.1observe M31 23:45–01:15M42M42 03:55–04:00: quality 0.2M42 04:00–04:30: quality 0.3M42 04:30–04:55: quality 0.4M42 04:55–05:25: quality 0.5M42 05:25–05:45: quality 0.2M42 05:45–05:55: quality 0.3M42 05:55–06:30: quality 0.1observe M42 04:15–05:25M45M45 00:20–00:40: quality 0.2M45 00:40–02:45: quality 0.3M45 02:45–03:00: quality 0.4M45 03:00–03:20: quality 0.3M45 03:20–05:25: quality 0.4M45 05:25–05:55: quality 0.2M45 05:55–06:30: quality 0.1observe M45 02:45–04:15NGC 7000NGC 7000 20:10–20:45: quality 0.1NGC 7000 20:45–21:00: quality 0.3NGC 7000 21:00–21:05: quality 0.4NGC 7000 21:05–21:20: quality 0.3NGC 7000 21:20–22:10: quality 0.7NGC 7000 22:10–00:25: quality 0.6NGC 7000 00:25–03:00: quality 0.5NGC 7000 03:00–05:15: quality 0.4NGC 7000 05:15–05:25: quality 0.3NGC 7000 05:25–05:35: quality 0.2NGC 7000 05:35–05:55: quality 0.1observe NGC 7000 20:45–22:15V1057 CygV1057 Cyg 20:10–20:45: quality 0.1V1057 Cyg 20:45–21:00: quality 0.3V1057 Cyg 21:00–21:05: quality 0.4V1057 Cyg 21:05–21:20: quality 0.3V1057 Cyg 21:20–22:10: quality 0.7V1057 Cyg 22:10–00:25: quality 0.6V1057 Cyg 00:25–03:00: quality 0.5V1057 Cyg 03:00–05:15: quality 0.4V1057 Cyg 05:15–05:25: quality 0.3V1057 Cyg 05:25–05:30: quality 0.2V1057 Cyg 05:30–05:55: quality 0.1observe V1057 Cyg 22:15–23:45M33M33 21:45–21:55: quality 0.2M33 21:55–22:30: quality 0.3M33 22:30–00:15: quality 0.4M33 00:15–05:20: quality 0.3M33 05:20–05:25: quality 0.4M33 05:25–05:55: quality 0.2M33 05:55–06:30: quality 0.1observe M33 01:15–02:45scheduleNGC 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
19:40–20:45 — nothing worth pointing at — 1.08
20:45–22:15 NGC 7000 1.5 0.53
22:15–23:45 V1057 Cyg 1.5 0.61
23:45–01:15 M31 1.5 0.38
01:15–02:45 M33 1.5 0.32
02:45–04:15 M45 1.5 0.36
04:15–05:25 M42 1.17 0.41
05:25–07:00 — nothing worth pointing at — 1.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 39 38 21:20–05:25 (marginal) 89.5° at 02:50 32.6° 1.5
M42 Great Orion Nebula 9 9 04:15–05:25 (marginal) 42.9° at 07:40 70.6° 1.17
M45 Seven Sisters 21 20 01:00–05:25 (marginal) 72.5° at 05:50 43.0° 1.5
NGC 7000 North America Nebula 69 68 21:20–23:20 (good) 87.3° at 23:05 62.4° 1.5
V1057 Cyg 69 68 21:20–23:15 (good) 87.3° at 23:05 62.3° 1.5
M33 Triangulum Pinwheel 26 26 22:10–03:00 (marginal) 79.1° at 03:40 23.3° 1.5
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-09"

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"}.