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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, 07 September 2027 · astronomical night 21:21 → 05:17 (7.93 h) · Moon 52% (first quarter) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 20:20–20:50: quality 0.1M31 20:50–21:15: quality 0.3M31 21:15–21:25: quality 0.4M31 21:25–22:45: quality 0.8M31 22:45–23:40: quality 0.9M31 23:40–05:20: quality 1.0M31 05:20–05:55: quality 0.5M31 05:55–06:30: quality 0.1observe M31 00:00–01:35M42M42 04:05–04:10: quality 0.4M42 04:10–04:25: quality 0.5M42 04:25–04:45: quality 0.6M42 04:45–05:00: quality 0.7M42 05:00–05:20: quality 0.8M42 05:20–05:55: quality 0.4M42 05:55–06:30: quality 0.1observe M42 04:45–05:55M45M45 00:30–00:35: quality 0.4M45 00:35–00:50: quality 0.5M45 00:50–01:00: quality 0.6M45 01:00–01:15: quality 0.7M45 01:15–02:05: quality 0.8M45 02:05–03:25: quality 0.9M45 03:25–05:20: quality 1.0M45 05:20–05:55: quality 0.5M45 05:55–06:30: quality 0.2observe M45 03:10–04:45NGC 7000NGC 7000 20:15–20:50: quality 0.1NGC 7000 20:50–21:25: quality 0.4NGC 7000 21:25–23:20: quality 0.9NGC 7000 23:20–02:45: quality 1.0NGC 7000 02:45–04:15: quality 0.9NGC 7000 04:15–05:10: quality 0.8NGC 7000 05:10–05:20: quality 0.7NGC 7000 05:20–05:50: quality 0.3NGC 7000 05:50–05:55: quality 0.2NGC 7000 05:55–06:10: quality 0.1observe NGC 7000 20:50–22:25V1057 CygV1057 Cyg 20:15–20:50: quality 0.1V1057 Cyg 20:50–21:25: quality 0.4V1057 Cyg 21:25–23:20: quality 0.9V1057 Cyg 23:20–02:45: quality 1.0V1057 Cyg 02:45–04:15: quality 0.9V1057 Cyg 04:15–05:10: quality 0.8V1057 Cyg 05:10–05:20: quality 0.7V1057 Cyg 05:20–05:50: quality 0.3V1057 Cyg 05:50–05:55: quality 0.2V1057 Cyg 05:55–06:10: quality 0.1observe V1057 Cyg 22:25–00:00M33M33 21:55–22:05: quality 0.4M33 22:05–22:20: quality 0.5M33 22:20–22:35: quality 0.6M33 22:35–22:50: quality 0.7M33 22:50–23:30: quality 0.8M33 23:30–00:50: quality 0.9M33 00:50–05:20: quality 1.0M33 05:20–05:55: quality 0.5M33 05:55–06:10: quality 0.2M33 06:10–06:30: quality 0.1observe M33 01:35–03:10scheduleNGC 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
19:40–20:50 — nothing worth pointing at — 1.17
20:50–22:25 NGC 7000 1.58 0.72
22:25–00:00 V1057 Cyg 1.58 0.94
00:00–01:35 M31 1.58 1.0
01:35–03:10 M33 1.58 1.0
03:10–04:45 M45 1.58 0.98
04:45–05:55 M42 1.17 0.58
05:55–06:55 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 21:25–05:20 (good) 89.5° at 03:00 125.9° 1.58
M42 Great Orion Nebula 22 unknown 04:35–05:20 (good) 42.9° at 07:50 146.6° 1.17
M45 Seven Sisters 100 unknown 00:55–05:20 (good) 72.5° at 06:00 162.9° 1.58
NGC 7000 North America Nebula 100 unknown 21:25–05:20 (good) 87.2° at 23:15 89.6° 1.58
V1057 Cyg 100 unknown 21:25–05:20 (good) 87.3° at 23:15 89.6° 1.58
M33 Triangulum Pinwheel 100 unknown 22:25–05:20 (good) 79.1° at 03:50 134.9° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-07"

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"}.