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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 Wednesday, 22 September 2027 · astronomical night 20:52 → 05:35 (8.72 h) · Moon 56% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:50–20:20: quality 0.1M31 20:20–20:55: quality 0.4M31 20:55–21:10: quality 0.8M31 21:10–22:40: quality 0.9M31 22:40–23:00: quality 1.0M31 23:00–02:10: quality 0.8M31 02:10–05:25: quality 0.7M31 05:25–05:40: quality 0.6M31 05:40–06:10: quality 0.3M31 06:10–06:45: quality 0.1observe M31 23:40–01:20observe M31 05:40–06:10M42M42 03:05–03:30: quality 0.3M42 03:30–04:00: quality 0.4M42 04:00–05:40: quality 0.5M42 05:40–06:10: quality 0.3M42 06:10–06:45: quality 0.1observe M42 04:40–05:40M45M45 23:30–23:40: quality 0.3M45 23:40–23:55: quality 0.4M45 23:55–00:15: quality 0.5M45 00:15–05:40: quality 0.6M45 05:40–06:10: quality 0.3M45 06:10–06:45: quality 0.1observe M45 03:00–04:40NGC 7000NGC 7000 19:50–20:20: quality 0.2NGC 7000 20:20–20:55: quality 0.5NGC 7000 20:55–23:00: quality 1.0NGC 7000 23:00–01:20: quality 0.9NGC 7000 01:20–02:40: quality 0.8NGC 7000 02:40–04:05: quality 0.7NGC 7000 04:05–04:25: quality 0.6NGC 7000 04:25–04:45: quality 0.5NGC 7000 04:45–05:05: quality 0.4NGC 7000 05:05–05:10: quality 0.3observe NGC 7000 20:20–22:00V1057 CygV1057 Cyg 19:50–20:20: quality 0.2V1057 Cyg 20:20–20:55: quality 0.5V1057 Cyg 20:55–23:00: quality 1.0V1057 Cyg 23:00–01:20: quality 0.9V1057 Cyg 01:20–02:40: quality 0.8V1057 Cyg 02:40–04:05: quality 0.7V1057 Cyg 04:05–04:25: quality 0.6V1057 Cyg 04:25–04:45: quality 0.5V1057 Cyg 04:45–05:05: quality 0.4V1057 Cyg 05:05–05:10: quality 0.3observe V1057 Cyg 22:00–23:40M33M33 20:55–21:00: quality 0.4M33 21:00–21:15: quality 0.5M33 21:15–21:30: quality 0.6M33 21:30–21:45: quality 0.7M33 21:45–22:30: quality 0.8M33 22:30–23:00: quality 0.9M33 23:00–23:45: quality 0.7M33 23:45–01:20: quality 0.8M33 01:20–05:20: quality 0.7M33 05:20–05:40: quality 0.6M33 05:40–06:10: quality 0.3M33 06:10–06:45: quality 0.1observe M33 01:20–03:00scheduleNGC 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
19:15–20:20 — nothing worth pointing at — 1.08
20:20–22:00 NGC 7000 1.67 0.82
22:00–23:40 V1057 Cyg 1.67 0.96
23:40–01:20 M31 1.67 0.8
01:20–03:00 M33 1.67 0.73
03:00–04:40 M45 1.67 0.61
04:40–05:40 M42 1.0 0.5
05:40–06:10 M31 0.5 0.31
06:10–07:10 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 97 unknown 20:55–05:40 (good) 89.7° at 02:00 59.3° 2.17
M42 Great Orion Nebula 17 unknown 03:15–05:40 (marginal) 42.9° at 06:50 32.4° 1.0
M45 Seven Sisters 59 unknown 01:10–04:10 (good) 72.5° at 05:00 23.4° 1.67
NGC 7000 North America Nebula 100 unknown 20:55–04:15 (good) 87.3° at 22:15 94.1° 1.67
V1057 Cyg 100 unknown 20:55–04:15 (good) 87.3° at 22:15 94.2° 1.67
M33 Triangulum Pinwheel 88 unknown 21:25–05:40 (good) 79.1° at 02:50 51.2° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-22"

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"}.