Planetary parade: Mercury, Mars, Saturn and Neptune line up this week

Mercury, Mars, Saturn and Neptune will appear clustered in the pre-dawn eastern sky April 16–23, 2026, with the clearest grouping expected April 18–20 about 30 minutes before sunrise; Neptune will require optical aid to see.

A planetary parade featuring Mercury, Mars, Saturn and Neptune will be visible in the pre-dawn eastern sky from April 16 to April 23, 2026. The article identifies April 18–20 as the optimal viewing window, when the planets will appear clustered within about 2° of each other along the ecliptic. This alignment is an optical effect from Earth's viewpoint rather than a physical convergence of the planets. Neptune is too faint to be seen without optical instruments. Viewing details: - Dates: April 16–23, 2026, with the best views April 18–20. - Best viewing begins roughly 30 minutes before local sunrise; example times cited are about 4:30–5:30 AM EDT and 5:00–5:45 AM IST. - Apparent order from the horizon upward will be Mercury, Saturn, Mars, then Neptune. - Neptune is not visible to the naked eye and requires a telescope or binoculars. - Mercury and Mars are the two planets most likely to be seen without optics; Mercury will appear low and faint near the horizon. - After April 24, Mercury is reported to move closer to the Sun and visibility will decline; before April 18, Saturn rises later and is harder to observe. Summary: The alignment offers a brief, concentrated viewing opportunity for early-morning skywatchers and illustrates how planets along the ecliptic can appear to line up from Earth. Visibility changes over the span of days, and the clearest window is noted as April 18–20; details on any live streams were not provided in the article.