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 North America Nebula: 11-02 (100), 11-16 (100), 11-17 (100), 11-18 (100), 11-19 (100) — by astronomy; check the weather when the night is within four days.

2046-11-02astronomy score per night — click a bar for that night2046-12-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-11-02 Fri	100	—	unknown	18:50–00:55 (good, 6.08 h)	87.2° 18:35	10.54	25%	75.5°
2046-11-03 Sat	98	—	unknown	18:50–00:50 (good, 6.0 h)	87.2° 18:30	10.58	34%	68.6°
2046-11-04 Sun	90	—	unknown	18:50–00:45 (good, 5.92 h)	87.2° 18:25	10.61	44%	62.8°
2046-11-05 Mon	82	—	unknown	18:50–00:40 (good, 5.83 h)	87.2° 18:20	10.65	54%	58.3°
2046-11-06 Tue	70	—	unknown	18:45–00:10 (good, 5.42 h)	87.1° 18:15	10.68	63%	55.3°
2046-11-07 Wed	60	—	unknown	18:45–21:50 (good, 3.08 h)	87.2° 18:15	10.72	72%	54.0°
2046-11-08 Thu	50	—	unknown	18:45–00:55 (marginal, 6.17 h)	87.2° 18:10	10.75	80%	54.5°
2046-11-09 Fri	45	—	unknown	18:45–00:40 (marginal, 5.92 h)	87.2° 18:05	10.78	87%	56.8°
2046-11-10 Sat	43	—	unknown	18:45–00:30 (marginal, 5.75 h)	87.2° 18:00	10.81	93%	60.5°
2046-11-11 Sun	44	—	unknown	18:45–00:20 (marginal, 5.58 h)	87.1° 18:00	10.84	97%	65.4°
2046-11-12 Mon	51	—	unknown	18:40–19:30 (good, 0.83 h)	87.2° 17:55	10.87	99%	71.3°
2046-11-13 Tue	59	—	unknown	18:40–20:50 (good, 2.17 h)	87.2° 17:50	10.91	100%	78.0°
2046-11-14 Wed	71	—	unknown	18:40–21:45 (good, 3.08 h)	87.2° 17:45	10.93	98%	85.1°
2046-11-15 Thu	81	—	unknown	18:40–22:40 (good, 4.0 h)	87.2° 17:40	10.96	95%	92.4°
2046-11-16 Fri	100	—	unknown	18:40–23:30 (good, 4.83 h)	87.2° 17:40	10.99	90%	99.8°
2046-11-17 Sat	100	—	unknown	18:40–23:35 (good, 4.92 h)	87.2° 17:35	11.02	83%	107.0°
2046-11-18 Sun	100	—	unknown	18:40–23:40 (good, 5.0 h)	87.2° 17:30	11.05	74%	113.6°
2046-11-19 Mon	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.2° 17:25	11.07	64%	119.3°
2046-11-20 Tue	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.1° 17:20	11.1	54%	123.6°
2046-11-21 Wed	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.2° 17:20	11.12	43%	125.9°
2046-11-22 Thu	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.15	32%	125.7°
2046-11-23 Fri	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.17	21%	123.0°
2046-11-24 Sat	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.2° 17:05	11.19	12%	118.1°
2046-11-25 Sun	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.1° 17:05	11.22	6%	111.4°
2046-11-26 Mon	100	—	unknown	18:35–23:20 (good, 4.75 h)	87.2° 17:00	11.24	2%	103.6°
2046-11-27 Tue	100	—	unknown	18:35–23:15 (good, 4.67 h)	87.2° 16:55	11.26	0%	95.2°
2046-11-28 Wed	100	—	unknown	18:35–23:10 (good, 4.58 h)	87.2° 16:50	11.28	1%	86.7°
2046-11-29 Thu	100	—	unknown	18:35–23:05 (good, 4.5 h)	87.2° 16:45	11.3	5%	78.6°
2046-11-30 Fri	100	—	unknown	18:35–23:05 (good, 4.5 h)	87.2° 16:45	11.32	11%	71.1°
2046-12-01 Sat	94	—	unknown	18:35–23:00 (good, 4.42 h)	87.2° 16:40	11.33	19%	64.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-11-02&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.