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 Seven Sisters: 02-02 (100), 02-03 (100), 02-04 (100), 02-05 (100), 02-06 (100) — by astronomy; check the weather when the night is within four days.

2032-02-02astronomy score per night — click a bar for that night2032-03-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-02 Mon	100	—	unknown	19:15–00:25 (good, 5.17 h)	72.5° 19:20	10.74	66%	144.6°
2032-02-03 Tue	100	—	unknown	19:15–00:25 (good, 5.17 h)	72.5° 19:15	10.71	57%	157.0°
2032-02-04 Wed	100	—	unknown	19:15–00:20 (good, 5.08 h)	72.5° 19:10	10.67	46%	169.3°
2032-02-05 Thu	100	—	unknown	19:20–00:20 (good, 5.0 h)	72.5° 19:10	10.64	36%	173.1°
2032-02-06 Fri	100	—	unknown	19:20–00:15 (good, 4.92 h)	72.5° 19:05	10.6	25%	161.1°
2032-02-07 Sat	100	—	unknown	19:20–00:10 (good, 4.83 h)	72.5° 19:00	10.57	16%	147.0°
2032-02-08 Sun	100	—	unknown	19:20–00:05 (good, 4.75 h)	72.5° 18:55	10.53	8%	132.4°
2032-02-09 Mon	100	—	unknown	19:25–00:05 (good, 4.67 h)	72.5° 18:50	10.49	3%	117.4°
2032-02-10 Tue	100	—	unknown	19:25–00:00 (good, 4.58 h)	72.5° 18:50	10.46	0%	102.2°
2032-02-11 Wed	100	—	unknown	19:25–23:55 (good, 4.5 h)	72.5° 18:45	10.42	1%	87.0°
2032-02-12 Thu	100	—	unknown	19:25–23:50 (good, 4.42 h)	72.5° 18:40	10.38	4%	72.1°
2032-02-13 Fri	98	—	unknown	19:25–23:45 (good, 4.33 h)	72.5° 18:35	10.34	10%	57.4°
2032-02-14 Sat	92	—	unknown	19:30–23:45 (good, 4.25 h)	72.5° 18:30	10.3	18%	43.2°
2032-02-15 Sun	79	—	unknown	19:30–23:40 (good, 4.17 h)	72.5° 18:30	10.26	28%	29.6°
2032-02-16 Mon	62	—	unknown	19:30–23:20 (good, 3.83 h)	72.5° 18:25	10.22	38%	16.7°
2032-02-17 Tue	47	—	unknown	19:30–22:35 (good, 3.08 h)	72.5° 18:20	10.18	48%	6.3°
2032-02-18 Wed	34	—	unknown	19:35–23:50 (marginal, 4.25 h)	72.5° 18:15	10.14	58%	11.2°
2032-02-19 Thu	24	—	unknown	19:35–23:35 (marginal, 4.0 h)	72.5° 18:15	10.1	67%	22.6°
2032-02-20 Fri	19	—	unknown	19:35–23:20 (marginal, 3.75 h)	72.5° 18:10	10.06	76%	34.4°
2032-02-21 Sat	21	—	unknown	19:35–23:10 (marginal, 3.58 h)	72.5° 18:05	10.02	84%	46.1°
2032-02-22 Sun	25	—	unknown	19:35–23:10 (marginal, 3.58 h)	72.5° 18:00	9.98	90%	57.9°
2032-02-23 Mon	30	—	unknown	19:40–23:15 (marginal, 3.58 h)	72.5° 17:55	9.93	95%	69.6°
2032-02-24 Tue	38	—	unknown	19:40–20:50 (good, 1.17 h)	72.5° 17:55	9.89	98%	81.4°
2032-02-25 Wed	48	—	unknown	19:40–21:55 (good, 2.25 h)	72.5° 17:50	9.85	100%	93.2°
2032-02-26 Thu	59	—	unknown	19:40–22:35 (good, 2.92 h)	72.5° 17:45	9.8	100%	105.2°
2032-02-27 Fri	67	—	unknown	19:45–22:40 (good, 2.92 h)	72.5° 17:40	9.76	98%	117.2°
2032-02-28 Sat	75	—	unknown	19:45–22:40 (good, 2.92 h)	72.5° 17:35	9.71	94%	129.4°
2032-02-29 Sun	75	—	unknown	19:45–22:35 (good, 2.83 h)	72.5° 17:35	9.67	88%	141.7°
2032-03-01 Mon	75	—	unknown	19:45–22:40 (good, 2.92 h)	72.5° 17:30	9.62	81%	154.0°
2032-03-02 Tue	72	—	unknown	19:50–22:35 (good, 2.75 h)	72.5° 17:25	9.58	72%	166.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-02&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.