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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 Thursday, 20 August 2026 · astronomical night 21:56 → 04:52 (6.93 h) · Moon 58% (waxing gibbous) · weather: ERA5 history

M31M31 21:30–21:55: quality 0.2M31 21:55–22:00: quality 0.3M31 22:00–22:05: quality 0.5M31 22:05–22:20: quality 0.6M31 22:20–22:45: quality 0.7M31 22:45–23:50: quality 0.8M31 23:50–00:55: quality 0.9M31 00:55–04:55: quality 1.0M31 04:55–05:35: quality 0.5M31 05:35–06:10: quality 0.2observe M31 00:40–02:20M42M42 05:15–05:30: quality 0.2M42 05:30–05:35: quality 0.3M42 05:35–06:10: quality 0.1M45M45 01:40–01:45: quality 0.4M45 01:45–02:00: quality 0.5M45 02:00–02:15: quality 0.6M45 02:15–02:25: quality 0.7M45 02:25–03:10: quality 0.8M45 03:10–04:35: quality 0.9M45 04:35–04:55: quality 1.0M45 04:55–05:35: quality 0.5M45 05:35–06:10: quality 0.2observe M45 04:00–05:35NGC 7000NGC 7000 20:45–21:20: quality 0.1NGC 7000 21:20–22:00: quality 0.4NGC 7000 22:00–23:50: quality 0.9NGC 7000 23:50–03:55: quality 1.0NGC 7000 03:55–04:55: quality 0.9NGC 7000 04:55–05:35: quality 0.4NGC 7000 05:35–06:10: quality 0.1observe NGC 7000 21:20–23:00V1057 CygV1057 Cyg 20:45–21:20: quality 0.1V1057 Cyg 21:20–22:00: quality 0.4V1057 Cyg 22:00–23:50: quality 0.9V1057 Cyg 23:50–03:55: quality 1.0V1057 Cyg 03:55–04:55: quality 0.9V1057 Cyg 04:55–05:35: quality 0.4V1057 Cyg 05:35–06:10: quality 0.1observe V1057 Cyg 23:00–00:40M33M33 23:05–23:15: quality 0.4M33 23:15–23:30: quality 0.5M33 23:30–23:45: quality 0.6M33 23:45–23:55: quality 0.7M33 23:55–00:50: quality 0.8M33 00:50–02:10: quality 0.9M33 02:10–04:55: quality 1.0M33 04:55–05:35: quality 0.5M33 05:35–06:10: quality 0.2observe M33 02:20–04:00scheduleNGC 7000V1057 CygM31M33M4522:0000:0002:0004:0006:00

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
20:10–21:20 — nothing worth pointing at — 1.17
21:20–23:00 NGC 7000 1.67 0.69
23:00–00:40 V1057 Cyg 1.67 0.94
00:40–02:20 M31 1.67 0.97
02:20–04:00 M33 1.67 0.99
04:00–05:35 M45 1.58 0.75
05:35–06:40 — nothing worth pointing at — 1.08

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 99 22:10–04:55 (good) 89.5° at 04:10 134.1° 1.67
M42 Great Orion Nebula 1 1 — 42.9° at 09:00 142.7° 0.0
M45 Seven Sisters 74 74 02:05–04:55 (good) 72.5° at 07:10 172.8° 1.58
NGC 7000 North America Nebula 100 99 22:00–04:55 (good) 87.3° at 00:25 95.8° 1.67
V1057 Cyg 100 99 22:00–04:55 (good) 87.3° at 00:25 95.8° 1.67
M33 Triangulum Pinwheel 100 99 23:35–04:55 (good) 79.1° at 05:00 144.3° 1.67

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-08-20"

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"}.