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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 Sunday, 20 September 2026 · astronomical night 20:55 → 05:33 (8.63 h) · Moon 69% (waxing gibbous) · weather: ERA5 history

M31M31 19:20–19:50: unusableM31 19:50–21:00: poorM31 21:00–05:35: goodM31 05:35–06:10: marginalM31 06:10–06:40: poorM31 06:40–07:10: unusableobserve M31 23:45–01:25M42M42 19:20–03:10: unusableM42 03:10–03:45: marginalM42 03:45–05:35: goodM42 05:35–06:10: marginalM42 06:10–06:40: poorM42 06:40–07:10: unusableobserve M42 04:45–06:10M45M45 19:20–23:35: unusableM45 23:35–00:10: marginalM45 00:10–05:35: goodM45 05:35–06:10: marginalM45 06:10–06:40: poorM45 06:40–07:10: unusableobserve M45 03:05–04:45NGC 7000NGC 7000 19:20–19:50: unusableNGC 7000 19:50–20:25: poorNGC 7000 20:25–21:00: marginalNGC 7000 21:00–04:40: goodNGC 7000 04:40–05:15: marginalNGC 7000 05:15–07:10: unusableobserve NGC 7000 20:25–22:05V1057 CygV1057 Cyg 19:20–19:50: unusableV1057 Cyg 19:50–20:25: poorV1057 Cyg 20:25–21:00: marginalV1057 Cyg 21:00–04:40: goodV1057 Cyg 04:40–05:15: marginalV1057 Cyg 05:15–07:10: unusableobserve V1057 Cyg 22:05–23:45M33M33 19:20–21:00: unusableM33 21:00–21:50: marginalM33 21:50–05:35: goodM33 05:35–06:10: marginalM33 06:10–06:40: poorM33 06:40–07:10: unusableobserve M33 01:25–03:05scheduleNGC 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
19:20–20:25 — nothing worth pointing at — 1.08
20:25–22:05 NGC 7000 1.67 0.58
22:05–23:45 V1057 Cyg 1.67 0.76
23:45–01:25 M31 1.67 0.88
01:25–03:05 M33 1.67 0.99
03:05–04:45 M45 1.67 1.0
04:45–06:10 M42 1.42 0.68
06:10–07:10 — nothing worth pointing at — 1.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 98 21:00–05:35 (good) 89.7° at 02:05 98.0° 1.67
M42 Great Orion Nebula 44 44 03:45–05:35 (good) 42.9° at 06:55 138.5° 1.42
M45 Seven Sisters 100 99 00:10–05:35 (good) 72.5° at 05:10 129.4° 1.67
NGC 7000 North America Nebula 100 98 21:00–04:40 (good) 87.2° at 22:20 72.3° 1.67
V1057 Cyg 100 98 21:00–04:40 (good) 87.3° at 22:20 72.3° 1.67
M33 Triangulum Pinwheel 100 99 21:50–05:35 (good) 79.1° at 02:55 103.1° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-20"

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"}.