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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 Monday, 20 September 2027 · astronomical night 20:56 → 05:33 (8.62 h) · Moon 76% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:55–20:25: quality 0.1M31 20:25–21:00: quality 0.4M31 21:00–21:20: quality 0.8M31 21:20–00:55: quality 0.6M31 00:55–04:55: quality 0.5M31 04:55–05:35: quality 0.4M31 05:35–06:10: quality 0.2M31 06:10–06:40: quality 0.1observe M31 23:35–01:10M42M42 03:15–03:30: quality 0.2M42 03:30–04:05: quality 0.3M42 04:05–05:35: quality 0.4M42 05:35–06:10: quality 0.2M42 06:10–06:40: quality 0.1observe M42 04:20–05:35M45M45 23:35–23:40: quality 0.2M45 23:40–00:10: quality 0.3M45 00:10–05:35: quality 0.4M45 05:35–06:10: quality 0.2M45 06:10–06:40: quality 0.1observe M45 02:45–04:20NGC 7000NGC 7000 19:55–20:25: quality 0.2NGC 7000 20:25–21:00: quality 0.5NGC 7000 21:00–21:20: quality 1.0NGC 7000 21:20–00:00: quality 0.8NGC 7000 00:00–02:05: quality 0.7NGC 7000 02:05–03:50: quality 0.6NGC 7000 03:50–04:30: quality 0.5NGC 7000 04:30–04:55: quality 0.4NGC 7000 04:55–05:20: quality 0.3observe NGC 7000 20:25–22:00V1057 CygV1057 Cyg 19:55–20:25: quality 0.2V1057 Cyg 20:25–21:00: quality 0.5V1057 Cyg 21:00–21:20: quality 1.0V1057 Cyg 21:20–00:00: quality 0.8V1057 Cyg 00:00–02:05: quality 0.7V1057 Cyg 02:05–03:50: quality 0.6V1057 Cyg 03:50–04:30: quality 0.5V1057 Cyg 04:30–04:55: quality 0.4V1057 Cyg 04:55–05:20: quality 0.3observe V1057 Cyg 22:00–23:35M33M33 21:00–21:10: quality 0.4M33 21:10–21:20: quality 0.5M33 21:20–21:40: quality 0.4M33 21:40–02:30: quality 0.5M33 02:30–05:35: quality 0.4M33 05:35–06:10: quality 0.2M33 06:10–06:40: quality 0.1observe M33 01:10–02:45scheduleNGC 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
19:20–20:25 — nothing worth pointing at — 1.08
20:25–22:00 NGC 7000 1.58 0.74
22:00–23:35 V1057 Cyg 1.58 0.79
23:35–01:10 M31 1.58 0.58
01:10–02:45 M33 1.58 0.47
02:45–04:20 M45 1.58 0.42
04:20–05:35 M42 1.25 0.39
05:35–07:10 — nothing worth pointing at — 1.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 85 unknown 21:00–23:50 (good) 89.6° at 02:05 38.8° 1.58
M42 Great Orion Nebula 10 unknown 03:50–05:35 (marginal) 42.9° at 07:00 42.3° 1.25
M45 Seven Sisters 28 unknown 23:55–05:35 (marginal) 72.5° at 05:10 3.6° 1.58
NGC 7000 North America Nebula 100 unknown 21:00–02:55 (good) 87.2° at 22:25 78.7° 1.58
V1057 Cyg 100 unknown 21:00–02:55 (good) 87.3° at 22:25 78.8° 1.58
M33 Triangulum Pinwheel 53 unknown 21:00–05:35 (marginal) 79.1° at 03:00 26.6° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-20"

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"}.