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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, 22 December 2025 · astronomical night 18:34 → 06:05 (11.51 h) · Moon 8% (waxing crescent) · weather: ERA5 history

M31M31 17:30–18:05: quality 0.1M31 18:05–18:35: quality 0.4M31 18:35–19:00: quality 0.8M31 19:00–20:00: quality 0.7observe M31 18:40–19:15M42M45M45 17:30–18:05: quality 0.1M45 18:05–18:35: quality 0.3M45 18:35–19:00: quality 0.7M45 19:00–19:05: quality 0.6M45 19:05–20:00: quality 0.7observe M45 19:15–19:50NGC 7000NGC 7000 17:30–18:05: quality 0.1NGC 7000 18:05–18:35: quality 0.4NGC 7000 18:35–19:05: quality 0.7NGC 7000 19:05–20:00: quality 0.6observe NGC 7000 19:50–20:00V1057 CygV1057 Cyg 17:30–18:05: quality 0.1V1057 Cyg 18:05–18:35: quality 0.4V1057 Cyg 18:35–19:05: quality 0.7V1057 Cyg 19:05–20:00: quality 0.6M33M33 17:30–18:05: quality 0.1M33 18:05–18:35: quality 0.4M33 18:35–19:00: quality 0.8M33 19:00–20:00: quality 0.7observe M33 18:05–18:40schedule18:0020:0022:0000:0002:0004:0006:00

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
16:50–18:05 — nothing worth pointing at — 1.25
18:05–18:40 M33 0.58 0.43
18:40–19:15 M31 0.58 0.73
19:15–19:50 M45 0.58 0.67
19:50–20:00 NGC 7000 0.17 0.61
20:00–07:50 — nothing worth pointing at — 11.83

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 19 18:35–20:00 (good) 89.7° at 19:00 87.1° 0.58
M42 Great Orion Nebula 89 0 — 42.9° at 23:50 129.9° 0.0
M45 Seven Sisters 100 14 18:35–20:00 (good) 72.5° at 22:00 116.6° 0.58
NGC 7000 North America Nebula 74 28 18:35–20:00 (good) 87.3° at 15:15 67.2° 0.17
V1057 Cyg 74 28 18:35–20:00 (good) 87.3° at 15:15 67.1° 0.0
M33 Triangulum Pinwheel 100 18 18:35–20:00 (good) 79.1° at 19:50 90.9° 0.58

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-22"

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"}.