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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, 31 August 2026 · astronomical night 21:34 → 05:08 (7.56 h) · Moon 85% (waning gibbous) · weather: ERA5 history

M31M31 20:50–21:00: quality 0.1M31 21:00–21:05: quality 0.2M31 21:05–21:20: quality 0.3M31 21:20–21:35: quality 0.2M31 21:35–00:45: quality 0.5M31 00:45–05:10: quality 0.4M31 05:10–05:45: quality 0.2M31 05:45–06:20: quality 0.1observe M31 23:50–01:15M42M42 04:30–04:40: quality 0.2M42 04:40–05:05: quality 0.3M42 05:05–05:10: quality 0.4M42 05:10–05:45: quality 0.2M42 05:45–06:20: quality 0.1observe M42 04:50–05:10M45M45 00:55–01:15: quality 0.2M45 01:15–02:05: quality 0.3M45 02:05–05:10: quality 0.4M45 05:10–05:45: quality 0.2M45 05:45–06:20: quality 0.1observe M45 02:40–04:05NGC 7000NGC 7000 20:25–21:00: quality 0.1NGC 7000 21:00–21:20: quality 0.5NGC 7000 21:20–21:35: quality 0.4NGC 7000 21:35–23:35: quality 0.7NGC 7000 23:35–02:50: quality 0.6NGC 7000 02:50–05:10: quality 0.5NGC 7000 05:10–05:45: quality 0.2NGC 7000 05:45–06:05: quality 0.1observe NGC 7000 21:00–22:25observe NGC 7000 04:05–04:50V1057 CygV1057 Cyg 20:25–21:00: quality 0.1V1057 Cyg 21:00–21:20: quality 0.5V1057 Cyg 21:20–21:35: quality 0.4V1057 Cyg 21:35–23:35: quality 0.7V1057 Cyg 23:35–02:50: quality 0.6V1057 Cyg 02:50–05:10: quality 0.5V1057 Cyg 05:10–05:45: quality 0.2V1057 Cyg 05:45–06:05: quality 0.1observe V1057 Cyg 22:25–23:50M33M33 22:20–22:25: quality 0.2M33 22:25–22:50: quality 0.3M33 22:50–05:10: quality 0.4M33 05:10–05:45: quality 0.2M33 05:45–06:20: quality 0.1observe M33 01:15–02:40scheduleNGC 7000V1057 CygM31M33M45NGC 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
19:55–21:00 — nothing worth pointing at — 1.08
21:00–22:25 NGC 7000 1.42 0.61
22:25–23:50 V1057 Cyg 1.42 0.67
23:50–01:15 M31 1.42 0.45
01:15–02:40 M33 1.42 0.4
02:40–04:05 M45 1.42 0.37
04:05–04:50 NGC 7000 0.75 0.48
04:50–05:10 M42 0.33 0.33
05:10–06:50 — nothing worth pointing at — 1.67

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 44 44 21:35–05:10 (marginal) 89.7° at 03:25 29.2° 1.42
M42 Great Orion Nebula 3 3 04:50–05:10 (marginal) 42.9° at 08:15 65.1° 0.33
M45 Seven Sisters 16 16 01:35–05:10 (marginal) 72.5° at 06:30 35.2° 1.42
NGC 7000 North America Nebula 75 74 21:35–01:05 (good) 87.3° at 23:40 63.8° 2.17
V1057 Cyg 75 74 21:35–01:05 (good) 87.3° at 23:40 63.7° 1.42
M33 Triangulum Pinwheel 30 30 22:40–05:10 (marginal) 79.1° at 04:15 17.3° 1.42
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-08-31"

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"}.