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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 Wednesday, 23 September 2026 · astronomical night 20:49 → 05:37 (8.78 h) · Moon 92% (waxing gibbous) · weather: ERA5 history

M31M31 19:15–19:45: unusableM31 19:45–20:50: poorM31 20:50–01:50: marginalM31 01:50–05:40: goodM31 05:40–06:15: marginalM31 06:15–06:45: poorM31 06:45–07:15: unusableobserve M31 00:00–01:35M42M42 19:15–03:00: unusableM42 03:00–03:45: marginalM42 03:45–05:40: goodM42 05:40–06:15: marginalM42 06:15–06:45: poorM42 06:45–07:15: unusableobserve M42 04:45–06:15M45M45 19:15–23:25: unusableM45 23:25–01:05: marginalM45 01:05–05:40: goodM45 05:40–06:15: marginalM45 06:15–06:45: poorM45 06:45–07:15: unusableobserve M45 01:35–03:10NGC 7000NGC 7000 19:15–19:45: unusableNGC 7000 19:45–20:50: poorNGC 7000 20:50–05:05: marginalNGC 7000 05:05–07:15: unusableobserve NGC 7000 20:50–22:25V1057 CygV1057 Cyg 19:15–19:45: unusableV1057 Cyg 19:45–20:50: poorV1057 Cyg 20:50–05:05: marginalV1057 Cyg 05:05–07:15: unusableobserve V1057 Cyg 22:25–00:00M33M33 19:15–20:50: unusableM33 20:50–21:40: poorM33 21:40–01:35: marginalM33 01:35–05:40: goodM33 05:40–06:15: marginalM33 06:15–06:45: poorM33 06:45–07:15: unusableobserve M33 03:10–04:45scheduleNGC 7000V1057 CygM31M45M33M4220:0022:0000:0002:0004:0006:00

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

Schedule

localtargethoursmean quality
19:15–20:50 — nothing worth pointing at — 1.58
20:50–22:25 NGC 7000 1.58 0.42
22:25–00:00 V1057 Cyg 1.58 0.55
00:00–01:35 M31 1.58 0.58
01:35–03:10 M45 1.58 0.7
03:10–04:45 M33 1.58 0.76
04:45–06:15 M42 1.5 0.68
06:15–07:15 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 92 01:50–05:40 (good) 89.7° at 01:55 65.9° 1.58
M42 Great Orion Nebula 48 47 03:45–05:40 (good) 42.9° at 06:45 112.3° 1.5
M45 Seven Sisters 100 96 01:05–05:40 (good) 72.5° at 04:55 92.5° 1.58
NGC 7000 North America Nebula 61 54 20:50–05:05 (marginal) 87.3° at 22:10 58.5° 1.58
V1057 Cyg 61 54 20:50–05:05 (marginal) 87.3° at 22:10 58.5° 1.58
M33 Triangulum Pinwheel 100 93 01:35–05:40 (good) 79.1° at 02:45 67.5° 1.58
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-23"

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"}.