Sky watch enthusiasts will have more reason to look closely at the sky over the next weekend. Right on the 4th of July, at 1 pm, the Earth will find itself in affliction, the furthest point from the Sun, at a distance of 1.016694252 astronomical units. On the 5th, the night sky will be the stage for 3 astronomical phenomena, including a penumbral eclipse of the Moon, visible in Portugal.
According to the Lisbon Astronomical Observatory (OAL), the Earth's entry into the affliction will make the Sun appear a little smaller than usual. Although the true diameter of Astro-Rei remains fixed, standing at 1.393 million kilometers, the angle observed between the left and right ends of the solar disk decreases or increases, depending on the distance to the Sun changes.
Beyond a typical illusion regarding the size of the Sun, the phenomenon does not prevent the northern hemisphere from being in the hottest season of the year. Remember that the seasons do not depend on the distance from the Earth to the Sun, but on the inclination of the Earth's axis relative to its orbital plane.
On July 5, the penumbral eclipse of the Moon, visible in Western Europe and also in Africa and the Americas, reaches its peak at 05:30 (Lisbon time). The OAL explains that, in Mainland Portugal, aLua enters Penumbra at around 04:04, when it is still in a low horizon position with a azimuth of 215 counted from North to East.
The phenomenon will last for an hour and 26 minutes and, although it does not have the spectacularity of a total eclipse, it is nevertheless something interesting to observe and its effect on the Moon will be like the formation of a shadow that takes some shine off it .
The moon's sunset will occur at 6:18 am and from that moment onwards it will no longer be possible for the Earth's natural satellite to come out of the gloom, once the phenomenon happens at 06h56. To find out what time you can accompany you depending on where you are in Portugal, see the table.
Also on Sunday, the Moon will enter its fullest phase in the Sagittarius constellation at around 5:44 am. In addition, Jpiter will be visible all night in the same constellation. The planet will follow the Moon at 1.9N by 11 pm in the southwest direction and its magnitude over the month will be -2.7.