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: 03-04 (70), 03-05 (67), 03-06 (65), 03-07 (61), 03-08 (60) — by astronomy; check the weather when the night is within four days.

2035-03-04astronomy score per night — click a bar for that night2035-04-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-03-04 Sun	70	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:20	9.52	24%	134.0°
2035-03-05 Mon	67	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:15	9.47	17%	122.0°
2035-03-06 Tue	65	—	unknown	19:50–22:25 (good, 2.58 h)	72.5° 17:15	9.42	10%	109.8°
2035-03-07 Wed	61	—	unknown	19:55–22:20 (good, 2.42 h)	72.5° 17:10	9.38	5%	97.2°
2035-03-08 Thu	60	—	unknown	19:55–22:15 (good, 2.33 h)	72.5° 17:05	9.33	1%	84.2°
2035-03-09 Fri	57	—	unknown	19:55–22:10 (good, 2.25 h)	72.5° 17:00	9.28	0%	71.0°
2035-03-10 Sat	56	—	unknown	19:55–22:10 (good, 2.25 h)	72.5° 16:55	9.23	1%	57.5°
2035-03-11 Sun	52	—	unknown	20:00–22:05 (good, 2.08 h)	72.5° 16:55	9.18	5%	43.9°
2035-03-12 Mon	46	—	unknown	20:00–22:00 (good, 2.0 h)	72.5° 16:50	9.13	11%	30.3°
2035-03-13 Tue	40	—	unknown	20:00–21:50 (good, 1.83 h)	72.5° 16:45	9.09	19%	17.4°
2035-03-14 Wed	32	—	unknown	20:00–21:35 (good, 1.58 h)	72.5° 16:40	9.04	29%	9.2°
2035-03-15 Thu	24	—	unknown	20:05–21:20 (good, 1.25 h)	72.5° 16:35	8.99	40%	16.4°
2035-03-16 Fri	17	—	unknown	20:05–22:05 (marginal, 2.0 h)	72.5° 16:35	8.94	51%	29.1°
2035-03-17 Sat	14	—	unknown	20:05–21:55 (marginal, 1.83 h)	72.5° 16:30	8.88	62%	42.6°
2035-03-18 Sun	13	—	unknown	20:05–21:50 (marginal, 1.75 h)	72.5° 16:25	8.83	73%	56.3°
2035-03-19 Mon	13	—	unknown	20:05–21:45 (marginal, 1.67 h)	72.5° 16:20	8.78	82%	69.9°
2035-03-20 Tue	15	—	unknown	20:10–21:45 (marginal, 1.58 h)	72.5° 16:20	8.73	90%	83.5°
2035-03-21 Wed	18	—	unknown	20:10–20:45 (good, 0.58 h)	72.5° 16:15	8.68	96%	96.9°
2035-03-22 Thu	21	—	unknown	20:10–21:00 (good, 0.83 h)	72.5° 16:10	8.63	99%	110.1°
2035-03-23 Fri	23	—	unknown	20:10–21:05 (good, 0.92 h)	72.5° 16:05	8.58	100%	123.0°
2035-03-24 Sat	22	—	unknown	20:15–21:05 (good, 0.83 h)	72.5° 16:00	8.52	99%	135.6°
2035-03-25 Sun	24	—	unknown	21:15–22:00 (good, 0.75 h)	72.5° 17:00	8.47	96%	147.8°
2035-03-26 Mon	23	—	unknown	21:15–22:05 (good, 0.83 h)	72.5° 16:55	8.42	91%	159.3°
2035-03-27 Tue	22	—	unknown	21:20–22:00 (good, 0.67 h)	72.5° 16:50	8.36	85%	168.8°
2035-03-28 Wed	20	—	unknown	21:20–21:55 (good, 0.58 h)	72.5° 16:45	8.31	77%	169.3°
2035-03-29 Thu	19	—	unknown	21:20–21:55 (good, 0.58 h)	72.5° 16:40	8.26	69%	160.5°
2035-03-30 Fri	17	—	unknown	21:20–21:50 (good, 0.5 h)	72.5° 16:40	8.2	60%	149.5°
2035-03-31 Sat	14	—	unknown	21:25–21:45 (good, 0.33 h)	72.5° 16:35	8.15	50%	138.1°
2035-04-01 Sun	13	—	unknown	21:25–21:40 (good, 0.25 h)	72.5° 16:30	8.09	41%	126.4°
2035-04-02 Mon	11	—	unknown	21:25–21:35 (good, 0.17 h)	72.5° 16:25	8.04	31%	114.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-03-04&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.