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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, 17 September 2027 · astronomical night 21:01 → 05:29 (8.46 h) · Moon 96% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 20:10–20:30: quality 0.1M31 20:30–21:05: quality 0.2M31 21:05–00:00: quality 0.4M31 00:00–05:30: quality 0.3M31 05:30–06:05: quality 0.2M31 06:05–06:40: quality 0.1observe M31 23:30–01:00M42M42 03:25–03:35: quality 0.2M42 03:35–04:00: quality 0.3M42 04:00–04:30: quality 0.4M42 04:30–05:30: quality 0.5M42 05:30–06:05: quality 0.3M42 06:05–06:40: quality 0.1observe M42 03:45–05:15M45M45 23:50–00:20: quality 0.2M45 00:20–02:55: quality 0.3M45 02:55–05:30: quality 0.4M45 05:30–06:05: quality 0.2M45 06:05–06:40: quality 0.1observe M45 01:00–03:45NGC 7000NGC 7000 20:00–20:30: quality 0.1NGC 7000 20:30–21:05: quality 0.3NGC 7000 21:05–21:15: quality 0.7NGC 7000 21:15–23:20: quality 0.6NGC 7000 23:20–02:15: quality 0.5NGC 7000 02:15–04:40: quality 0.4NGC 7000 04:40–05:15: quality 0.3NGC 7000 05:15–05:30: quality 0.2observe NGC 7000 20:30–22:00V1057 CygV1057 Cyg 20:00–20:30: quality 0.1V1057 Cyg 20:30–21:05: quality 0.3V1057 Cyg 21:05–21:15: quality 0.7V1057 Cyg 21:15–23:20: quality 0.6V1057 Cyg 23:20–02:15: quality 0.5V1057 Cyg 02:15–04:40: quality 0.4V1057 Cyg 04:40–05:15: quality 0.3V1057 Cyg 05:15–05:30: quality 0.2observe V1057 Cyg 22:00–23:30M33M33 21:15–21:30: quality 0.2M33 21:30–22:05: quality 0.3M33 22:05–22:45: quality 0.4M33 22:45–05:20: quality 0.3M33 05:20–05:30: quality 0.4M33 05:30–06:05: quality 0.2M33 06:05–06:40: quality 0.1observe M33 05:15–05:30scheduleNGC 7000V1057 CygM31M45M4220:0022:0000:0002:0004:0006:00

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
19:25–20:30 — nothing worth pointing at — 1.08
20:30–22:00 NGC 7000 1.5 0.52
22:00–23:30 V1057 Cyg 1.5 0.58
23:30–01:00 M31 1.5 0.34
01:00–03:45 M45 2.75 0.34
03:45–05:15 M42 1.5 0.42
05:15–05:30 M33 0.25 0.35
05:30–07:05 — nothing worth pointing at — 1.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 34 unknown 21:05–01:30 (marginal) 89.6° at 02:20 30.3° 1.5
M42 Great Orion Nebula 13 unknown 03:45–05:30 (marginal) 42.9° at 07:10 71.3° 1.5
M45 Seven Sisters 23 unknown 00:35–05:30 (marginal) 72.5° at 05:20 42.3° 2.75
NGC 7000 North America Nebula 65 unknown 21:05–22:10 (good) 87.3° at 22:35 60.5° 1.5
V1057 Cyg 65 unknown 21:05–22:10 (good) 87.3° at 22:35 60.5° 1.5
M33 Triangulum Pinwheel 25 unknown 21:45–01:25 (marginal) 79.1° at 03:10 21.3° 0.25
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-17"

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"}.