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 Vega: 03-31 (100), 04-01 (100), 04-02 (100), 04-03 (100), 04-04 (100) — by astronomy; check the weather when the night is within four days.

2046-03-17astronomy score per night — click a bar for that night2046-04-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-03-17 Sat	89	—	unknown	01:30–04:55 (good, 3.42 h)	87.1° 07:15	8.87	74%	116.3°
2046-03-18 Sun	87	—	unknown	01:30–04:55 (good, 3.42 h)	87.1° 07:10	8.82	83%	115.3°
2046-03-19 Mon	76	—	unknown	01:30–04:55 (good, 3.42 h)	87.1° 07:10	8.77	91%	112.5°
2046-03-20 Tue	70	—	unknown	01:30–04:50 (good, 3.33 h)	87.1° 07:05	8.71	97%	108.2°
2046-03-21 Wed	64	—	unknown	01:35–04:50 (good, 3.25 h)	87.1° 07:00	8.66	100%	102.6°
2046-03-22 Thu	59	—	unknown	01:45–04:50 (good, 3.08 h)	87.1° 06:55	8.61	99%	96.3°
2046-03-23 Fri	55	—	unknown	01:55–04:45 (good, 2.83 h)	87.1° 06:50	8.56	96%	89.7°
2046-03-24 Sat	55	—	unknown	01:50–05:45 (good, 2.92 h)	87.1° 07:50	8.5	90%	83.2°
2046-03-25 Sun	56	—	unknown	02:20–05:45 (good, 3.42 h)	87.1° 07:45	8.45	83%	77.3°
2046-03-26 Mon	59	—	unknown	02:10–05:40 (good, 3.5 h)	87.1° 07:40	8.4	74%	72.2°
2046-03-27 Tue	70	—	unknown	01:40–05:40 (good, 4.0 h)	87.1° 07:35	8.35	64%	68.2°
2046-03-28 Wed	80	—	unknown	01:40–05:35 (good, 3.92 h)	87.1° 07:35	8.29	54%	65.4°
2046-03-29 Thu	90	—	unknown	01:35–05:35 (good, 4.0 h)	87.1° 07:30	8.24	44%	63.9°
2046-03-30 Fri	97	—	unknown	01:30–05:35 (good, 4.08 h)	87.1° 07:25	8.18	34%	63.7°
2046-03-31 Sat	100	—	unknown	01:25–05:30 (good, 4.08 h)	87.1° 07:20	8.13	25%	64.8°
2046-04-01 Sun	100	—	unknown	01:20–05:30 (good, 4.17 h)	87.1° 07:15	8.07	18%	67.0°
2046-04-02 Mon	100	—	unknown	01:20–05:25 (good, 4.08 h)	87.1° 07:15	8.02	11%	70.2°
2046-04-03 Tue	100	—	unknown	01:15–05:25 (good, 4.17 h)	87.1° 07:10	7.96	6%	74.1°
2046-04-04 Wed	100	—	unknown	01:10–05:25 (good, 4.25 h)	87.1° 07:05	7.91	2%	78.7°
2046-04-05 Thu	100	—	unknown	01:05–05:20 (good, 4.25 h)	87.1° 07:00	7.85	0%	83.7°
2046-04-06 Fri	100	—	unknown	01:05–05:20 (good, 4.25 h)	87.1° 06:55	7.8	0%	89.0°
2046-04-07 Sat	100	—	unknown	01:00–05:15 (good, 4.25 h)	87.1° 06:55	7.74	2%	94.4°
2046-04-08 Sun	100	—	unknown	00:55–05:15 (good, 4.33 h)	87.1° 06:50	7.68	6%	99.7°
2046-04-09 Mon	100	—	unknown	00:50–05:15 (good, 4.42 h)	87.1° 06:45	7.63	11%	104.7°
2046-04-10 Tue	100	—	unknown	00:45–05:10 (good, 4.42 h)	87.1° 06:40	7.57	18%	109.2°
2046-04-11 Wed	100	—	unknown	00:45–05:10 (good, 4.42 h)	87.1° 06:35	7.51	27%	112.8°
2046-04-12 Thu	100	—	unknown	00:45–05:10 (good, 4.42 h)	87.1° 06:35	7.46	37%	115.3°
2046-04-13 Fri	100	—	unknown	00:40–05:05 (good, 4.42 h)	87.1° 06:30	7.4	48%	116.4°
2046-04-14 Sat	100	—	unknown	00:40–05:05 (good, 4.42 h)	87.1° 06:25	7.34	59%	116.0°
2046-04-15 Sun	100	—	unknown	00:40–05:00 (good, 4.33 h)	87.1° 06:20	7.28	70%	113.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-03-17&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.