Get ready for a unique astronomical phenomenon! On Saturday, April 18, an amazing parade of planets will unfold in the pre-dawn sky. Saturn, Mars, Mercury, and Neptune will gather in one sector, creating an impressive illusion of alignment. A pleasant bonus: the first three planets will be easily visible to the naked eye!
On Saturday, April 18, we are in for a truly exciting celestial display. Four majestic planets of our Solar System – Saturn, Mars, Mercury, and Neptune – will dramatically align in the pre-dawn sky. This rare astronomical event will create a stunning illusion of a "parade of planets."
Notably, Saturn, Mars, and Mercury will be visible even without special optics. The April alignment will be particularly compact, as the planets will come together very closely, forming a tight group along the ecliptic – the very imaginary line along which the Sun and celestial bodies travel.
What is a planetary parade?
Evgeny Burmistrov, an authoritative expert in the field of astronomy, explained the essence of this phenomenon. He stated: "The planets move around the sun approximately in one plane, which astronomers call the ecliptic. For an observer on Earth, it projects onto the sky as an arc. When several celestial objects simultaneously find themselves within a limited section of this curve, an alignment occurs. Although they are actually separated by millions of kilometers, from our perspective, it creates the illusion that they are lined up in a single line."
Types of celestial alignments
Several types of parades are distinguished, depending on the number of planets involved. If three objects line up in a row, it is considered a mini-parade, while four planets form a small parade.
When five or six planets align, it is already a large parade. The rarest and most grand spectacle is a full parade, when all the planets of the Solar System are visible in the sky.
Details of the April parade
The expert emphasizes the details of the upcoming event: "On April 18, four celestial bodies – Saturn, Mars, Mercury, and Neptune – will align in the sky. The first three can be seen with the naked eye. However, to spot the last one, a telescope will be needed. In the pre-dawn twilight, this planet will be too dim – its stellar magnitude will be about +7.8. The objects will line up along a curved line above the eastern horizon."
How to observe the parade?
To enjoy this April alignment, a bit of patience and the right timing will be required. The peak brightness of Mercury has already passed on April 3, when it was at its maximum distance from the Sun, and by April 18, this planet will become less noticeable.
About half an hour before sunrise, when the sky in the east begins to brighten, look for Mercury, Mars, and Saturn very low on the horizon. Mercury, Mars, and Neptune will be visiting the constellation Pisces, while Saturn will join them from the constellation Cetus. This morning, April 18, will be an ideal starting point for your astronomical observations.
The closest approach of the planets in space is expected on April 20 at around 1:00 PM Moscow time. At this moment, all participants of the parade will gather as close to each other as possible. Mercury will come within an incredibly small distance of Saturn – just 0.4°, while Saturn, Mars, and Mercury will align almost in a perfect straight line about 1.6° long.
Good news for observers: a new moon will occur on April 17, meaning there will be no bright moonlight. This will create ideal conditions for observation, allowing even the dim Neptune to be visible in the dark sky, of course, with the appropriate equipment.
Although April 18 is considered the optimal date to start observations, the alignment will be noticeable for several days afterward, so you will have time to enjoy this spectacle.
