Noticias:
The total lunar eclipse will be seen in Fuerteventura at dawn next Monday.
We will have to get up early (or stay up late) to see an astronomical phenomenon that will not occur again until the year 27
This May, the moon stars in astronomical phenomena. First of all, because it will look a little bigger than usual due to its proximity to Earth. But, above all, because there will be an eclipse of the moon.
This will be the first total eclipse that we will see in Spain since
July 2019. And we will have to wait more than a year to be able to see another one, since until
October 2023 the necessary circumstances will not occur.
The lunar eclipse on May 16, 2022 will be total. That is, the Moon will completely enter the umbra zone of the Earth's shadow. This eclipse will be visible in much of the world. Specifically, it can be enjoyed from all over Latin America, much of the United States and Canada, West Africa and the Iberian Peninsula, which will be the best point in continental Europe to see it (although it can be enjoyed even more from the Canary Islands).
To see an eclipse of the Moon you do not need any special equipment. It can be observed with the naked eye without protection, unlike what happens with solar eclipses. Even so, simple binoculars can improve the observation experience. To be able to enjoy it even more, it is also advisable to get as far as possible from areas with light pollution. The darker the environment, the better.
In addition, the eclipse will occur early in the morning in Fuerteventura. This means that the Moon will slowly approach the horizon in the west, where it will set just before the Sun rises in the east. Thus, it will be better to have your eyes clear to that point. This also implies that on May 16 it will be time to get up early to see the total eclipse of the Moon.
WHEN TO SEE THE TOTAL LUNAR ECLIPSE?
From the island, the eclipse will be seen in the early morning of Sunday, May 15 to Monday, May 16. Although the event will last more than five hours in total, from here it will only be visible for just under four, as the Moon will set (hiding behind the horizon) before the eclipse ends. Even so, it will be possible to see the so-called umbra phase completely.
In this NASA outline are all the details about how, where and when the eclipse is going to occur. These are the hours to take into account to see it from Spain:
2:32 a.m. on May 16. The first contact occurs. The Moon touches the penumbra zone, so the eclipse is barely noticeable.
3:28 a.m. First contact with the terrestrial umbra. The eclipse is already perceptible, although still partially.
4:29 a.m. The Moon completely enters the umbra and darkens, dyeing red.
5:11 a.m. Maximum of the eclipse. It is the moment of greatest concealment.
7:21. In the Canary Islands you can see the eclipse even longer, since the Moon will set at 7:21, local time, in Fuerteventura. The Moon will leave the twilight zone at 7:50 Canarian time and 8:50 peninsular Spanish time.
THE PHASES OF THE MOON AND ECLIPSES
The Moon is the inseparable companion of the Earth. Our satellite completes a lap around our planet every 27 days and nearly eight hours. Throughout this orbit, the Moon always receives light from the Sun. However, from the surface of the Earth we do not always see it in the same way. When the Moon is located between the planet and the star, we see the dark side and say that there is a new moon. And when the Moon is right at the opposite point, with the Earth in the middle, we see it fully illuminated. At that moment we say that there is a full moon. In between, the rest of the lunar phases remain.
Thus, every 28 days (to be rounded, since the cycle of lunar phases actually lasts 29 days and almost 13 hours) the Earth is located between the Sun and the Moon. Since our planet is quite a bit larger than the satellite, how come the Moon is still getting sunlight at that time and doesn't stay in the shadow of the terrestrial globe? That's the same reason we don't see a lunar eclipse once a month. The Moon's orbit is somewhat inclined with respect to the plane in which the Earth orbits the Sun. Thus, most of the time it manages to dodge the shadow cone that our planet projects.
WHAT IS A LUNAR ECLIPSE?
There are times, however, when the Moon's orbit does cross earth's shadow cone. That's when we talk about lunar eclipse. Thus, lunar eclipses occur in the full moon phase and when the Earth is placed right between the Moon and the Sun. As they point out from NASA, "the shadow of the Earth falls on the surface of the Moon, attenuating it and sometimes turning the lunar surface red over the course of a few hours." Each lunar eclipse is visible from the middle of the Earth. Half of it's night, of course.
Types of lunar eclipses
Depending on how this alignment between the Sun, Earth, and Moon occurs, three different types of eclipses can occur:
Total lunar eclipse. The Moon is located in the central part of the Earth's shadow, called the umbra. The satellite still receives some sunlight, but it comes through the atmosphere of our planet, so the lighting is dim and red and orange (later we will explain why).
Partial lunar eclipse. The alignment between the three stars is not perfect and the Moon only crosses the umbra zone partially. In those cases, you can see how the shadowing advances on the lunar surface without completely covering it and then receding.
Penumbra eclipse. Sometimes, the Moon does not reach the umbra zone and is located only in the penumbra zone, an area of soft shadow where the Earth only blocks a part of the sunlight. In these cases, the lunar brightness is slightly attenuated.
WHY DOES THE BLOOD MOON OCCUR?
During lunar eclipses, the surface of the satellite is illuminated by reddish and orange tones. It is what is popularly known as the blood moon, although the reasons for this phenomenon are not very esoteric. The blood moon has to do, like everything in this life, with the laws of physics and chemistry. Specifically, with a phenomenon called Rayleigh scattering.
The light emitted by the sun travels through space in waves and each of the colors that form that white light has different properties. Blue light has a short wavelength. That is why the particles in our atmosphere disperse it easily and we see the blue sky. Red light, however, has a long wavelength (the longest in the visible spectrum), so it more easily dodges obstacles from Earth's atmosphere.
During the total lunar eclipse, some of the sunlight passes through Earth's atmosphere and reaches the satellite. However, it does not manage to arrive in its entirety. Along the way, trapped in the gases and particles that surround our planet, the colors with the shortest wavelength remain. Thus, only reddish tones reach the satellite, staining it with 'blood'. The more obstacles there are in the atmosphere (such as suspended dust or clouds), the redder the Moon will become during the eclipse.
And what would a lunar eclipse look like from the Moon itself? Well, like a total solar eclipse and sitting on a reddish ground. For now, there is no living thing on our satellite that will observe this phenomenon. If one day there is a permanent lunar base, the photos can be as spectacular as the recreation of the image above. For now, we will have to keep waiting and settle for solar eclipses from Earth. The next total observable from Spain will be on August 2, 2027.