Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Andromeda Galaxy: 11-04 (100), 11-05 (100), 11-06 (100), 11-07 (100), 11-08 (100) — by astronomy; check the weather when the night is within four days.

2029-11-04astronomy score per night — click a bar for that night2029-12-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-11-04 Sun	100	—	unknown	18:50–04:15 (good, 9.42 h)	89.5° 22:10	10.62	3%	151.0°
2029-11-05 Mon	100	—	unknown	18:50–04:15 (good, 9.42 h)	89.7° 22:05	10.65	0%	148.3°
2029-11-06 Tue	100	—	unknown	18:45–04:10 (good, 9.42 h)	89.7° 22:00	10.69	1%	140.1°
2029-11-07 Wed	100	—	unknown	18:45–04:05 (good, 9.33 h)	89.7° 21:55	10.72	4%	129.1°
2029-11-08 Thu	100	—	unknown	18:45–04:00 (good, 9.25 h)	89.5° 21:50	10.75	11%	117.0°
2029-11-09 Fri	100	—	unknown	18:45–03:55 (good, 9.17 h)	89.6° 21:50	10.79	19%	104.7°
2029-11-10 Sat	100	—	unknown	18:45–03:55 (good, 9.17 h)	89.7° 21:45	10.82	28%	92.6°
2029-11-11 Sun	100	—	unknown	18:40–03:50 (good, 9.17 h)	89.7° 21:40	10.85	39%	80.8°
2029-11-12 Mon	100	—	unknown	18:40–03:45 (good, 9.08 h)	89.6° 21:35	10.88	49%	69.6°
2029-11-13 Tue	97	—	unknown	18:40–03:40 (good, 9.0 h)	89.5° 21:35	10.91	59%	59.0°
2029-11-14 Wed	90	—	unknown	18:40–03:35 (good, 8.92 h)	89.6° 21:30	10.94	68%	49.1°
2029-11-15 Thu	83	—	unknown	02:35–03:35 (good, 1.0 h)	89.7° 21:25	10.97	77%	40.4°
2029-11-16 Fri	55	—	unknown	18:40–04:05 (marginal, 9.42 h)	89.7° 21:20	11.0	84%	33.4°
2029-11-17 Sat	37	—	unknown	18:40–03:40 (marginal, 9.0 h)	89.6° 21:15	11.02	91%	29.4°
2029-11-18 Sun	29	—	unknown	00:20–03:15 (marginal, 2.92 h)	89.5° 21:15	11.05	95%	29.5°
2029-11-19 Mon	31	—	unknown	18:35–21:10 (marginal, 2.58 h)	89.7° 21:10	11.08	98%	33.6°
2029-11-20 Tue	40	—	unknown	18:35–23:30 (marginal, 4.92 h)	89.7° 21:05	11.1	100%	40.6°
2029-11-21 Wed	55	—	unknown	18:35–02:40 (marginal, 8.08 h)	89.7° 21:00	11.13	100%	49.3°
2029-11-22 Thu	68	—	unknown	18:35–20:10 (good, 1.58 h)	89.5° 20:55	11.15	97%	58.9°
2029-11-23 Fri	100	—	unknown	18:35–22:40 (good, 4.08 h)	89.6° 20:55	11.17	93%	69.2°
2029-11-24 Sat	100	—	unknown	18:35–00:40 (good, 6.08 h)	89.7° 20:50	11.2	87%	79.9°
2029-11-25 Sun	100	—	unknown	18:35–02:05 (good, 7.5 h)	89.7° 20:45	11.22	80%	90.8°
2029-11-26 Mon	100	—	unknown	18:35–02:30 (good, 7.92 h)	89.6° 20:40	11.24	71%	101.9°
2029-11-27 Tue	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.5° 20:40	11.26	61%	113.1°
2029-11-28 Wed	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.6° 20:35	11.28	51%	124.2°
2029-11-29 Thu	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.7° 20:30	11.3	40%	134.9°
2029-11-30 Fri	100	—	unknown	18:35–02:30 (good, 7.92 h)	89.7° 20:25	11.32	29%	144.2°
2029-12-01 Sat	100	—	unknown	18:35–02:30 (good, 7.92 h)	89.6° 20:20	11.34	19%	150.2°
2029-12-02 Sun	100	—	unknown	18:35–02:25 (good, 7.83 h)	89.5° 20:20	11.35	11%	150.4°
2029-12-03 Mon	100	—	unknown	18:35–02:25 (good, 7.83 h)	89.7° 20:15	11.37	4%	144.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-11-04&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.