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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.

Try: an autumn deep-sky night  ·  ← previous night · next night →

Night of Thursday, 17 September 2026 · astronomical night 21:01 → 05:29 (8.48 h) · Moon 41% (waxing crescent) · weather: ERA5 history

M31M31 19:25–20:00: unusableM31 20:00–20:30: poorM31 20:30–21:05: marginalM31 21:05–05:30: goodM31 05:30–06:05: marginalM31 06:05–06:40: poorM31 06:40–07:05: unusableobserve M31 23:50–01:30M42M42 19:25–03:25: unusableM42 03:25–03:55: marginalM42 03:55–05:30: goodM42 05:30–06:05: marginalM42 06:05–06:40: poorM42 06:40–07:05: unusableobserve M42 04:50–06:05M45M45 19:25–23:50: unusableM45 23:50–00:15: marginalM45 00:15–05:30: goodM45 05:30–06:05: marginalM45 06:05–06:40: poorM45 06:40–07:05: unusableobserve M45 03:10–04:50NGC 7000NGC 7000 19:25–20:00: unusableNGC 7000 20:00–20:30: poorNGC 7000 20:30–21:05: marginalNGC 7000 21:05–04:55: goodNGC 7000 04:55–05:30: marginalNGC 7000 05:30–07:05: unusableobserve NGC 7000 20:30–22:10V1057 CygV1057 Cyg 19:25–20:00: unusableV1057 Cyg 20:00–20:30: poorV1057 Cyg 20:30–21:05: marginalV1057 Cyg 21:05–04:55: goodV1057 Cyg 04:55–05:30: marginalV1057 Cyg 05:30–07:05: unusableobserve V1057 Cyg 22:10–23:50M33M33 19:25–21:15: unusableM33 21:15–21:45: marginalM33 21:45–05:30: goodM33 05:30–06:05: marginalM33 06:05–06:40: poorM33 06:40–07:05: unusableobserve M33 01:30–03:10scheduleNGC 7000V1057 CygM31M33M45M4220:0022:0000:0002:0004:0006:00

Faded bands: each target's own windows (green good, amber marginal, pink poor). Dark blue: the schedule. Grey columns: twilight.

Schedule

localtargethoursmean quality
19:25–20:30 — nothing worth pointing at — 1.08
20:30–22:10 NGC 7000 1.67 0.76
22:10–23:50 V1057 Cyg 1.67 0.99
23:50–01:30 M31 1.67 1.0
01:30–03:10 M33 1.67 1.0
03:10–04:50 M45 1.67 1.0
04:50–06:05 M42 1.25 0.65
06:05–07:05 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 100 21:05–05:30 (good) 89.5° at 02:20 128.0° 1.67
M42 Great Orion Nebula 39 39 03:55–05:30 (good) 42.9° at 07:10 145.4° 1.25
M45 Seven Sisters 100 100 00:15–05:30 (good) 72.5° at 05:20 165.0° 1.67
NGC 7000 North America Nebula 100 100 21:05–04:55 (good) 87.2° at 22:35 91.4° 1.67
V1057 Cyg 100 100 21:05–04:55 (good) 87.3° at 22:35 91.4° 1.67
M33 Triangulum Pinwheel 100 100 21:45–05:30 (good) 79.1° at 03:10 137.1° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-17"

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"}.