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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, 01 September 2026 · astronomical night 21:32 → 05:09 (7.61 h) · Moon 76% (waning gibbous) · weather: ERA5 history

M31M31 20:45–21:00: quality 0.1M31 21:00–21:15: quality 0.2M31 21:15–21:35: quality 0.3M31 21:35–21:40: quality 0.6M31 21:40–21:45: quality 0.7M31 21:45–02:30: quality 0.5M31 02:30–03:55: quality 0.4M31 03:55–05:10: quality 0.3M31 05:10–05:50: quality 0.2M31 05:50–06:20: quality 0.1observe M31 00:20–02:00M42M42 04:25–04:30: quality 0.1M42 04:30–05:00: quality 0.2M42 05:00–05:10: quality 0.3M42 05:10–05:50: quality 0.2M42 05:50–06:20: quality 0.1M45M45 00:50–01:00: quality 0.2M45 01:00–01:35: quality 0.3M45 01:35–03:00: quality 0.4M45 03:00–05:10: quality 0.3M45 05:10–05:50: quality 0.2M45 05:50–06:20: quality 0.1observe M45 03:40–04:00observe M45 05:00–05:10NGC 7000NGC 7000 20:25–21:00: quality 0.1NGC 7000 21:00–21:35: quality 0.4NGC 7000 21:35–21:45: quality 0.9NGC 7000 21:45–02:00: quality 0.7NGC 7000 02:00–03:00: quality 0.6NGC 7000 03:00–04:00: quality 0.5NGC 7000 04:00–04:05: quality 0.4NGC 7000 04:05–05:00: quality 0.3NGC 7000 05:00–05:10: quality 0.4NGC 7000 05:10–05:50: quality 0.2observe NGC 7000 21:00–22:40observe NGC 7000 04:00–05:00V1057 CygV1057 Cyg 20:25–21:00: quality 0.1V1057 Cyg 21:00–21:35: quality 0.4V1057 Cyg 21:35–21:45: quality 0.9V1057 Cyg 21:45–02:00: quality 0.7V1057 Cyg 02:00–03:00: quality 0.6V1057 Cyg 03:00–04:00: quality 0.5V1057 Cyg 04:00–04:05: quality 0.4V1057 Cyg 04:05–05:00: quality 0.3V1057 Cyg 05:00–05:10: quality 0.4V1057 Cyg 05:10–05:50: quality 0.2observe V1057 Cyg 22:40–00:20M33M33 22:15–22:20: quality 0.2M33 22:20–22:50: quality 0.3M33 22:50–23:10: quality 0.4M33 23:10–02:30: quality 0.5M33 02:30–03:55: quality 0.4M33 03:55–05:10: quality 0.3M33 05:10–05:50: quality 0.2M33 05:50–06:20: quality 0.1observe M33 02:00–03:40scheduleNGC 7000V1057 CygM31M33NGC 700020:0022:0000:0002:0004:0006:00

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
19:50–21:00 — nothing worth pointing at — 1.17
21:00–22:40 NGC 7000 1.67 0.61
22:40–00:20 V1057 Cyg 1.67 0.68
00:20–02:00 M31 1.67 0.5
02:00–03:40 M33 1.67 0.41
03:40–04:00 M45 0.33 0.33
04:00–05:00 NGC 7000 1.0 0.34
05:00–05:10 M45 0.17 0.34
05:10–06:50 — nothing worth pointing at — 1.67

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 76 67 21:35–21:45 (good) 89.7° at 03:20 30.0° 1.67
M42 Great Orion Nebula 4 3 — 42.9° at 08:10 54.6° 0.0
M45 Seven Sisters 19 16 01:15–04:00 (marginal) 72.5° at 06:25 21.5° 0.5
NGC 7000 North America Nebula 100 88 21:35–03:00 (good) 87.2° at 23:35 69.5° 2.67
V1057 Cyg 100 88 21:35–03:00 (good) 87.3° at 23:35 69.5° 1.67
M33 Triangulum Pinwheel 41 36 22:35–04:00 (marginal) 79.1° at 04:10 15.3° 1.67

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-01"

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"}.