Autumn begins on the 22nd, the night quickly wins land a day, it is a great time to enjoy heaven as it is transformably transformed. Here we indicate 10 astronomical curiosities for the harvest season.
1) Autumn in the northern hemisphere (and spring in the south) will begin on Wednesday, September 22 at 9pm 21m peninsular time (20h 21m in the Canary Islands).
2) Summer time will end on Sunday, October 31. That day, at 3 o'clock in the morning (2h in the Canary Islands) we will have to delay watches until 2 pm (1h in the Canary Islands). The change will make it dawn before (at official hours) and that the afternoons seem shorter.
3) The start of autumn is the time when the night gains ground more quickly a day. The nights are 3 more minutes, each passing day.
4) The first full moon of this autumn will take place on October 20 at the Piscis constellation. This full moon, the first after the equinox, is usually called 'harvest moon', because the light of this plenilunium allowed to extend at night the collection tasks of this time of year.
5) Venus will shine splendid in the west in the evening twilight. In the first part of the autumn nights, Jupiter and Saturn will remain visible. According to advance the station, the two giants will be displaced from Southeast to the Southwest and will lie down a little earlier every day.
6) After months without being observable, Mars will refresh again, although timidly, with little brightness and low on the horizon, at dawn as of November 10. The elusive Mercury will make an appearance, also to Alba, from October 15 to November 12.
8) The second autumn eclipse, much more interesting, is a total of sun that can be enjoyed on December 4 from South Africa, Antarctica and adjacent oceans, but not from Spain.
9) The most substantial meteor rains of autumn, the Leonidas and the Gemínidas, will take place in very unfavorable conditions for their observation because the Moon will significantly illuminate the sky background attenuating the gloss of the meteors. Indeed, LEÓNIDAS will reach its maximum activity around November 17, only two days before the full moon, while the gemines will have its maximum on December 13, that is, with the moon already very grown that will reach the Plenilunio on 19
10) the lace of the tropic year (defined by the duration of the Earth's orbit) in our solar calendar (with its years of different duration, sometimes bisites) makes it, every year, the autumn equinox can happen on four dates Different: 21, 22, 23 or September 24. However, throughout the 21st century, it will only begin on day 22 or at 23 (official time of Spain). The earliest start of the station will be given in the year 2096, while he began later took place in 2003.
11) In terrestrial poles, Equinox Day is very special. At the North Pole, a period of 6 months of day is passed to a period of 6 months at night. There, on the 22nd, the Sun will be seen for 12 hours as a ground disk on the horizon that hides so as not to be seen again until the spring equinox.
12) This autumn will last 89 days and 20 hours. It will end on December 21 with the beginning of winter.
Rafael Bachiller is Director of the National Astronomical Observatory (National Geographic Institute) and academic of the Royal Academy of Doctors of Spain.Updated Date: 22 September 2021, 18:55