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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, 13 September 2027 · astronomical night 21:09 → 05:24 (8.25 h) · Moon 96% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 20:15–20:40: quality 0.1M31 20:40–21:10: quality 0.2M31 21:10–23:20: quality 0.5M31 23:20–03:30: quality 0.6M31 03:30–05:20: quality 0.7M31 05:20–05:25: quality 1.0M31 05:25–06:00: quality 0.5M31 06:00–06:35: quality 0.1observe M31 00:05–01:35M42M42 03:40–04:00: quality 0.4M42 04:00–04:15: quality 0.5M42 04:15–04:35: quality 0.6M42 04:35–05:20: quality 0.7M42 05:20–05:25: quality 0.8M42 05:25–06:00: quality 0.4M42 06:00–06:35: quality 0.1observe M42 04:35–06:00M45M45 00:05–00:15: quality 0.3M45 00:15–00:35: quality 0.4M45 00:35–00:55: quality 0.5M45 00:55–02:00: quality 0.6M45 02:00–03:20: quality 0.7M45 03:20–05:20: quality 0.8M45 05:20–05:25: quality 1.0M45 05:25–06:00: quality 0.5M45 06:00–06:35: quality 0.2observe M45 01:35–03:05NGC 7000NGC 7000 20:05–20:40: quality 0.1NGC 7000 20:40–21:10: quality 0.3NGC 7000 21:10–22:15: quality 0.6NGC 7000 22:15–01:30: quality 0.5NGC 7000 01:30–01:50: quality 0.6NGC 7000 01:50–05:00: quality 0.5NGC 7000 05:00–05:20: quality 0.4NGC 7000 05:20–05:25: quality 0.5NGC 7000 05:25–05:30: quality 0.3NGC 7000 05:30–05:45: quality 0.2observe NGC 7000 20:40–20:45observe NGC 7000 21:10–22:35V1057 CygV1057 Cyg 20:05–20:40: quality 0.1V1057 Cyg 20:40–21:10: quality 0.3V1057 Cyg 21:10–22:15: quality 0.6V1057 Cyg 22:15–01:30: quality 0.5V1057 Cyg 01:30–01:50: quality 0.6V1057 Cyg 01:50–05:00: quality 0.5V1057 Cyg 05:00–05:20: quality 0.4V1057 Cyg 05:20–05:25: quality 0.5V1057 Cyg 05:25–05:30: quality 0.3V1057 Cyg 05:30–05:45: quality 0.2observe V1057 Cyg 22:35–00:05M33M33 21:30–21:55: quality 0.3M33 21:55–22:20: quality 0.4M33 22:20–00:20: quality 0.5M33 00:20–03:15: quality 0.6M33 03:15–05:20: quality 0.7M33 05:20–05:25: quality 1.0M33 05:25–06:00: quality 0.5M33 06:00–06:35: quality 0.1observe M33 03:05–04:35scheduleNGC 7000V1057 CygM31M45M33M4220:0022:0000:0002:0004:0006:00

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
19:30–20:40 — nothing worth pointing at — 1.17
20:40–20:45 NGC 7000 0.08 0.3
20:45–21:10 — nothing worth pointing at — 0.42
21:10–22:35 NGC 7000 1.42 0.56
22:35–00:05 V1057 Cyg 1.5 0.53
00:05–01:35 M31 1.5 0.58
01:35–03:05 M45 1.5 0.67
03:05–04:35 M33 1.5 0.67
04:35–06:00 M42 1.42 0.6
06:00–07:00 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 99 unknown 02:00–05:25 (good) 89.7° at 02:35 64.0° 1.5
M42 Great Orion Nebula 29 unknown 04:25–05:25 (good) 42.9° at 07:25 112.3° 1.42
M45 Seven Sisters 100 unknown 01:20–05:25 (good) 72.5° at 05:40 91.3° 1.5
NGC 7000 North America Nebula 58 unknown 21:10–05:25 (marginal) 87.3° at 22:50 56.7° 1.5
V1057 Cyg 58 unknown 21:10–05:25 (marginal) 87.3° at 22:50 56.6° 1.5
M33 Triangulum Pinwheel 100 unknown 01:35–05:25 (good) 79.1° at 03:25 65.9° 1.5
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-13"

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"}.