On this Tuesday, April 21, 2026, the moon remains a slender presence in the night sky. Currently in its waxing phase with only 18% visibility, the lunar disk is steadily reclaiming its light following the new moon that occurred on April 17. This progression is part of the synodic month—the 29.5-day interval known as a lunation—that governs the celestial rhythm visible from Earth.
According to data from the National Institute of Meteorology (Inmet), this month’s cycle began with a full moon on April 1, followed by the waning phase on April 10. The current trajectory will lead to the first quarter moon on April 23 at 11:33 PM, marking the point where the moon has completed one-quarter of its orbit around our planet since the last new moon.
While the average duration of a lunar cycle is nearly 30 days, the interval is subtly variable, shaped by the complex gravitational interplay between the Earth, Moon, and Sun. Each of the four primary phases—new, first quarter, full, and last quarter—lasts approximately seven days, punctuated by transitional "interphases" such as the waxing crescent and the gibbous moon. For observers, these shifts serve as a predictable, silent metronome for the passing month.
With reporting from Olhar Digital.
Source · Olhar Digital
