Moon Phase on 2026-07-18
On 2026-07-18, the Moon is in the Waxing Crescent phase. The visible fraction of the lunar disc illuminated by the Sun is 14.8%, with an elapsed synodic age of 3.7 days.
Lunar Phase & Illumination Visualizer
Jean Meeus, Astronomical Algorithms 2nd ed. Chapter 49 (Phases of the Moon)
7-Day Moon Phase Progression
| Date | Phase Name | Illumination | Moon Age | Link |
|---|---|---|---|---|
Wed, Jul 15 | New Moon | 0.6% | 0.7 days | View |
Thu, Jul 16 | Waxing Crescent | 3.3% | 1.7 days | View |
Fri, Jul 17 | Waxing Crescent | 8.1% | 2.7 days | View |
Sat, Jul 18 | Waxing Crescent | 14.8% | 3.7 days | View |
Sun, Jul 19 | Waxing Crescent | 23.0% | 4.7 days | View |
Mon, Jul 20 | Waxing Crescent | 32.6% | 5.7 days | View |
Tue, Jul 21 | First Quarter | 42.8% | 6.7 days | View |
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Moon Phase FAQs
Q1.What lunar phase occurs on 2026-07-18?
On 2026-07-18, the Moon is in the Waxing Crescent phase, displaying approximately 14.8% disc illumination facing Earth with a lunar age of 3.7 days since the last New Moon.
Q2.How long is a complete lunar synodic month?
A synodic month (from one New Moon to the next) averages 29.53058867 days (29 days, 12 hours, 44 minutes). This duration represents the time required for the Moon to align in the same geometric relationship relative to the Earth and Sun.
Q3.How is the illuminated fraction calculated?
Illumination is determined using Jean Meeus’ trigonometric relation k = (1 - cos(2π · phase)) / 2, where phase is the normalized progress (0.0 to 1.0) along the 29.53-day synodic cycle.
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