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: 02-15 (79), 02-28 (75), 02-29 (75), 03-01 (75), 03-02 (72) — by astronomy; check the weather when the night is within four days.

2032-02-15astronomy score per night — click a bar for that night2032-03-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-03-03 Wed	70	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:20	9.53	62%	174.3°
2032-03-04 Thu	67	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:20	9.48	52%	165.0°
2032-03-05 Fri	65	—	unknown	19:50–22:25 (good, 2.58 h)	72.5° 17:15	9.44	40%	151.8°
2032-03-06 Sat	62	—	unknown	19:55–22:20 (good, 2.42 h)	72.5° 17:10	9.39	30%	137.9°
2032-03-07 Sun	60	—	unknown	19:55–22:15 (good, 2.33 h)	72.5° 17:05	9.34	20%	123.5°
2032-03-08 Mon	58	—	unknown	19:55–22:15 (good, 2.33 h)	72.5° 17:00	9.29	11%	108.8°
2032-03-09 Tue	56	—	unknown	19:55–22:10 (good, 2.25 h)	72.5° 17:00	9.25	5%	93.9°
2032-03-10 Wed	54	—	unknown	19:55–22:05 (good, 2.17 h)	72.5° 16:55	9.2	1%	79.0°
2032-03-11 Thu	51	—	unknown	20:00–22:00 (good, 2.0 h)	72.5° 16:50	9.15	0%	64.2°
2032-03-12 Fri	49	—	unknown	20:00–21:55 (good, 1.92 h)	72.5° 16:45	9.1	2%	49.6°
2032-03-13 Sat	45	—	unknown	20:00–21:55 (good, 1.92 h)	72.5° 16:40	9.05	7%	35.4°
2032-03-14 Sun	39	—	unknown	20:00–21:45 (good, 1.75 h)	72.5° 16:40	9.0	14%	21.8°
2032-03-15 Mon	33	—	unknown	20:05–21:35 (good, 1.5 h)	72.5° 16:35	8.95	22%	9.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-15&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.