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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 Saturday, 25 September 2027 · astronomical night 20:46 → 05:39 (8.87 h) · Moon 23% (waning crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 19:45–20:15: quality 0.1M31 20:15–20:50: quality 0.4M31 20:50–21:00: quality 0.8M31 21:00–22:25: quality 0.9M31 22:25–04:30: quality 1.0M31 04:30–05:40: quality 0.9M31 05:40–06:15: quality 0.4M31 06:15–06:45: quality 0.1observe M31 23:45–01:30M42M42 02:55–03:05: quality 0.4M42 03:05–03:25: quality 0.5M42 03:25–03:45: quality 0.6M42 03:45–04:40: quality 0.7M42 04:40–05:40: quality 0.8M42 05:40–06:15: quality 0.4M42 06:15–06:45: quality 0.1observe M42 05:00–06:15M45M45 23:15–23:25: quality 0.4M45 23:25–23:40: quality 0.5M45 23:40–23:50: quality 0.6M45 23:50–00:05: quality 0.7M45 00:05–00:50: quality 0.8M45 00:50–02:15: quality 0.9M45 02:15–02:35: quality 1.0M45 02:35–05:40: quality 0.9M45 05:40–06:10: quality 0.5M45 06:10–06:15: quality 0.4M45 06:15–06:45: quality 0.1observe M45 03:15–05:00NGC 7000NGC 7000 19:45–20:15: quality 0.2NGC 7000 20:15–20:50: quality 0.5NGC 7000 20:50–01:35: quality 1.0NGC 7000 01:35–02:45: quality 0.9NGC 7000 02:45–03:55: quality 0.8NGC 7000 03:55–04:10: quality 0.7NGC 7000 04:10–04:30: quality 0.6NGC 7000 04:30–04:45: quality 0.5NGC 7000 04:45–05:00: quality 0.4observe NGC 7000 20:15–22:00V1057 CygV1057 Cyg 19:45–20:15: quality 0.2V1057 Cyg 20:15–20:50: quality 0.5V1057 Cyg 20:50–01:35: quality 1.0V1057 Cyg 01:35–02:45: quality 0.9V1057 Cyg 02:45–03:55: quality 0.8V1057 Cyg 03:55–04:10: quality 0.7V1057 Cyg 04:10–04:30: quality 0.6V1057 Cyg 04:30–04:45: quality 0.5V1057 Cyg 04:45–05:00: quality 0.4observe V1057 Cyg 22:00–23:45M33M33 20:40–20:50: quality 0.2M33 20:50–21:05: quality 0.5M33 21:05–21:20: quality 0.6M33 21:20–21:30: quality 0.7M33 21:30–22:20: quality 0.8M33 22:20–23:40: quality 0.9M33 23:40–03:50: quality 1.0M33 03:50–05:40: quality 0.9M33 05:40–06:15: quality 0.4M33 06:15–06:45: quality 0.1observe M33 01:30–03:15scheduleNGC 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
19:10–20:15 — nothing worth pointing at — 1.08
20:15–22:00 NGC 7000 1.75 0.83
22:00–23:45 V1057 Cyg 1.75 1.0
23:45–01:30 M31 1.75 1.0
01:30–03:15 M33 1.75 0.98
03:15–05:00 M45 1.75 0.92
05:00–06:15 M42 1.25 0.59
06:15–07:15 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 20:50–05:40 (good) 89.5° at 01:45 96.2° 1.75
M42 Great Orion Nebula 41 unknown 03:35–05:40 (good) 42.9° at 06:40 50.0° 1.25
M45 Seven Sisters 97 unknown 23:45–05:40 (good) 72.5° at 04:50 65.8° 1.75
NGC 7000 North America Nebula 100 unknown 20:50–04:20 (good) 87.2° at 22:05 116.1° 1.75
V1057 Cyg 100 unknown 20:50–04:20 (good) 87.3° at 22:05 116.1° 1.75
M33 Triangulum Pinwheel 100 unknown 21:10–05:40 (good) 79.1° at 02:40 92.0° 1.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-09-25"

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"}.