Two meteor showers will hit their peak visibility on Tuesday night, lighting the skies in glowing streaks into the following morning. The Southern Delta Aquariids and the Alpha Capricornids will be active until just Aug. 12th. Tonight marks a particularly good time to look up at the starry sky and catch them, however, as the moon will only be 27% full, increasing the visibility for the showers. The cosmic phenomena are precursors to the Perseids shower, considered the “best meteor shower of the year” according to NASA. That shower is due to hit its peak in just a few weeks, though its visibility could be affected by the moon.

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Meteor showers are caused by the entrance of cosmic debris into the Earth’s atmosphere at elevated speeds. They are best viewed on a clear night. Here’s what to know. What are the Southern Delta Aquariids and Alpha Capricornids? The Southern Delta Aquariids are a meteor shower typically active for a few weeks starting from mid-July. The shower travels at a velocity of 25 miles per second, according to the American Meteor Society (AMS) and is best seen by those living further south. They are typically difficult to spot due to their faint light, NASA reports, and most visible when the moon is not out. The Alpha Capricornids are not a particularly strong shower, and rarely have more than 5 meteors per hour. However, they are remarkable because those that are visible often have bright fireballs. “If you are looking for that one spectacular event to happen during a watch session, an Alpha Capricornid may be the one that gets you the most excited,” Nick Moskovitz, an astronomer with the Lowell Observatory in Arizona told NPR.

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That shower will be well seen by those on either side of the equator, according to the American Meteor Society (AMS). It also travels more slowly, sailing through the sky at a velocity of 14 miles per second.

When and where can you see them best?

Meteor showers are best seen after midnight, according to the AMS, as the darker night makes them easier to spot. That means the moon’s peak also affects visibility: If the moon is more than one half illuminated when meteor showers peak, they will be difficult to observe. Onlookers should also move away from the big city to avoid pollution and other light sources interfering with their view.

The Southern Delta Aquariids will be best seen in the early morning hours, AMS reports.

The organization says that showers can best be spotted some 30 degrees away from their radiant—the point where meteors appear to come from. The radiant point of the Southern Delta Aquariids is located within the Aquarius constellation, while the Alpha Capricornids’ is in the Capricornus constellation. Both are in the southern part of the sky, meaning those hoping to view the showers should move to a location with an unobstructed view of that area.

Those who miss the two meteor showers can still try to observe the Perseids shower, which will hit its peak on August 12-13.