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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 Friday, 31 July 2026 · astronomical night 22:33 → 04:21 (5.79 h) · Moon 95% (waning gibbous) · weather: ERA5 history

M31M31 22:50–23:15: quality 0.3M31 23:15–23:40: quality 0.4M31 23:40–04:20: quality 0.5M31 04:20–04:25: quality 0.6M31 04:25–05:05: quality 0.3M31 05:05–05:45: quality 0.1observe M31 00:45–02:10M42M45M45 02:55–03:10: quality 0.3M45 03:10–03:30: quality 0.4M45 03:30–03:55: quality 0.5M45 03:55–04:25: quality 0.6M45 04:25–05:05: quality 0.3M45 05:05–05:45: quality 0.1observe M45 03:35–04:25observe M45 04:45–05:05NGC 7000NGC 7000 21:15–21:55: quality 0.1NGC 7000 21:55–22:35: quality 0.3NGC 7000 22:35–01:45: quality 0.6NGC 7000 01:45–04:25: quality 0.5NGC 7000 04:25–05:05: quality 0.3NGC 7000 05:05–05:45: quality 0.1observe NGC 7000 21:55–23:20V1057 CygV1057 Cyg 21:15–21:55: quality 0.1V1057 Cyg 21:55–22:35: quality 0.3V1057 Cyg 22:35–01:40: quality 0.6V1057 Cyg 01:40–04:25: quality 0.5V1057 Cyg 04:25–05:05: quality 0.3V1057 Cyg 05:05–05:45: quality 0.1observe V1057 Cyg 23:20–00:45M33M33 00:20–00:25: quality 0.2M33 00:25–00:50: quality 0.3M33 00:50–01:15: quality 0.4M33 01:15–04:05: quality 0.5M33 04:05–04:25: quality 0.6M33 04:25–05:05: quality 0.3M33 05:05–05:45: quality 0.1observe M33 02:10–03:35scheduleNGC 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
20:40–21:55 — nothing worth pointing at — 1.25
21:55–23:20 NGC 7000 1.42 0.49
23:20–00:45 V1057 Cyg 1.42 0.6
00:45–02:10 M31 1.42 0.51
02:10–03:35 M33 1.42 0.5
03:35–04:25 M45 0.83 0.54
04:25–04:45 — nothing worth pointing at — 0.33
04:45–05:05 M45 0.33 0.3
05:05–06:20 — nothing worth pointing at — 1.25

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 42 42 23:00–04:25 (marginal) 89.6° at 05:25 59.1° 1.42
M42 Great Orion Nebula 0 0 — 42.9° at 10:20 105.7° 0.0
M45 Seven Sisters 14 14 03:00–04:25 (marginal) 72.5° at 08:30 84.4° 1.17
NGC 7000 North America Nebula 63 63 22:35–00:10 (good) 87.2° at 01:45 57.1° 1.42
V1057 Cyg 63 63 22:35–00:05 (good) 87.3° at 01:45 57.0° 1.42
M33 Triangulum Pinwheel 30 30 00:35–04:25 (marginal) 79.1° at 06:15 59.7° 1.42

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-07-31"

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"}.