Sitemap of the Communication and Information service of the Royal Observatory of Belgium

Pages

• Astronomical informations
  • Calendar
    • Algorithm for the computation of the Easter date
    • Belgian holidays
      • Belgian Holidays 2020
      • Belgian Holidays 2021
      • Belgian Holidays 2022
      • Belgian Holidays 2023
      • Belgian Holidays 2024
      • Belgian Holidays 2025
      • Belgian Holidays 2026
      • Belgian Holidays 2027
    • Easter dates from 1583 to 3000
    • The Gregorian calendar
    • The Roman and Julian calendars
    • Yearly calendars
      • Calendar with week numbers 2020
      • Calendar with week numbers 2021
      • Calendar with week numbers 2022
      • Calendar with week numbers 2023
      • Calendar with week numbers 2024
      • Calendar with week numbers 2025
      • Calendar with week numbers 2026
      • Calendar with week numbers 2027
  • Eclipses
    • Eclipses 2019
    • Eclipses 2020
    • Eclipses 2021
    • Eclipses 2022
    • Eclipses 2023
    • Eclipses 2024
  • Geographical coordinates of our sites
  • Moon
    • Lunation and lunation number
    • Moon 2019
    • Moon phases 2019
    • Moon phases 2020
    • Moon phases 2021
    • Moon phases 2022
    • Moon phases 2023
    • Moon phases 2024
    • Moon phases 2025
    • Moon phases 2026
    • Moonrise and moonset in 2020
    • Moonrise and moonset in 2021
    • Moonrise and moonset in 2022
    • Moonrise and moonset in 2023
    • Moonrise and moonset in 2024
    • Moonrise and moonset in 2025
    • Moonrise and moonset in 2026
  • Sun
    • Lengthening and shortening of the day duration in 2019
    • Lengthening and shortening of the day duration in 2020
    • Lengthening and shortening of the day duration in 2021
    • Lengthening and shortening of the day duration in 2022
    • Lengthening and shortening of the day duration in 2023
    • Lengthening and shortening of the day duration in 2024
    • Lengthening and shortening of the day duration in 2025
    • Lengthening and shortening of the day duration in 2026
    • Lengthening and shortening of the day duration in 2027
    • Passing of the sun through the zodiac signs in 2020
    • Passing of the sun through the zodiac signs in 2021
    • Passing of the sun through the zodiac signs in 2022
    • Passing of the sun through the zodiac signs in 2023
    • Passing of the sun through the zodiac signs in 2024
    • Passing of the sun through the zodiac signs in 2025
    • Passing of the sun through the zodiac signs in 2026
    • Passing of the sun through the zodiac signs in 2027
    • Passing of the Sung through the zodiac signs in 2019
    • Position of the Sun in the sky (horizontal coordinates)
    • Seasons 2019
    • Seasons 2020
    • Seasons 2021
    • Seasons 2022
    • Seasons 2023
    • Seasons 2024
    • Seasons 2025
    • Seasons 2026
    • Seasons 2027
    • Sunrise and sunset in 2019
    • Sunrise and sunset in 2020
    • Sunrise and sunset in 2021
    • Sunrise and sunset in 2022
    • Sunrise and sunset in 2023
    • Sunrise and sunset in 2024
    • Sunrise and sunset in 2025
    • Sunrise and sunset in 2026
  • Time and daylight saving time
    • Daylight saving time in 2019
    • Daylight saving time in 2020
    • Daylight saving time in 2021
    • Daylight saving time in 2022
    • Daylight saving time in 2023
    • Daylight saving time in 2024
    • Daylight saving time in 2025
    • Daylight saving time in 2026
    • Daylight saving time in 2027
    • The Belgian timezone and the daylight time saving system
      • Dates of summer time and winter time in Belgium
    • Universal time and legal time in Belgium
• Contact us
• Ephemeris
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• Sitemap of the Communication and Information service of the Royal Observatory of Belgium
• The service

FAQs

• Why does the day of the equinox have (slightly) more than 12 hours of daylight?
• Why does the Easter date in 2019 fall on April 21 but not on March 24?
• Questions about Christian, Islamic, Jewish calendars...
• What is the Gregorian Calendar Reform?
• When does a new century of millenium begin?
• Questions about weather and climate
• Questions about tides
• Shooting stars in summer (the Perseids)
• What is een shooting star (meteor)?

FAQ Categories

• Celestial phenomena
• Seasons
• Time and calendar