This is when the sky above our horizon is truly dark. In fact, it doesn’t get sufficiently dark until the sun has set 18 degrees below our horizon…This twilight condition is called “astronomical twilight” and it does not happen until after 11pm ‘daylight savings time’ for our latitude of 45 degrees during the month of June.Īstronomical Twilight is defined to be the time at which the sun is set below the horizon by 18 degrees. In June, astronomers don’t have a lot of time to observe at night because summer solstice occurs around June 21 making daylight linger well into the evening. West to East: Jupiter the Moon, Mars and Saturn – for Jcourtesy Stellarium Planetarium Software The red giant star Antares is also bright, but don’t confuse it with the planets. As shown in this diagram Jupiter appears in the western sky, then scanning eastward the Moon, Mars, and then Saturn appear along the Ecliptic (path of the planets). One may only see a couple of Eta Eridanids during the viewing window, which is why it was only identified in 2005.During the month of June 2016, three bright planets appear in our evening sky. The Eta Eridanids are a minor shower with a ZHR of about 6 meteors per hour They will be visible whenever the radiant is above the horizon, but from more northern locations it is only visible for a short time.
So if you change from London at 3am in August (UTC+1), the time in Tokyo will be 11 am (UTC+9). When you change location in Stellarium the time doesn't change. Tokyo, which is much further south, and doesn't use Daylight saving, sees Eta Eridani rise at about 1am (local time). On 11th of August, Eta Eridani rises at about 3am in London, About an hour before twilight. The radiant on that date is just south of Eta Eridani, at about -11 degrees.
The Eta Eridanids are a meteor shower that have a peak on about 11th of August.
Eridanus is a constellation that is next to Orion, and like Orion, it is easiest to see during winter. Eta Eridani has a declination of about -8 degrees, so it is visible from most of the Northern Hemisphere.
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