Moon Phase Today: How the Moon Will Appear on August 17
Today's lunar phase according to NASA's daily Moon guide and observation tips
1Today's Moon Phase
As of August 17, the Moon is in the Waxing Crescent phase. NASA's daily tracking data shows that 24% of the lunar surface is illuminated. During this phase, a thin sliver of light appears on the Moon's right side (in the Northern Hemisphere). The Waxing Crescent represents one of the early stages in the Moon's 29.5-day orbit around Earth. The illuminated portion will gradually increase each night.
2Naked Eye Observations
Tonight, observers can see Mare Crisium (Sea of Crises) and Mare Fecunditatis (Sea of Fertility) with the naked eye. These large basaltic plains formed from ancient volcanic activity appear as dark patches on the Moon's surface. Viewed from the Northern Hemisphere, they're particularly visible in the lower right quadrant. The crescent phase creates more pronounced shadows compared to full Moon phases.
3Telescope Viewing Tips
Using binoculars or a telescope, observers can spot the Endymion crater in the Moon's northeastern region. This 125 km diameter crater is notable for its depth and central peaks. During the crescent phase, shadows make the crater's edges more distinct. Even amateur astronomers with 10x50 binoculars can observe these features clearly.
4Next Full Moon Date
The next Full Moon will occur on August 28, when the entire lunar face will be illuminated. This marks the halfway point in the Moon's 29.5-day orbit around Earth. From August 17 onward, the illuminated portion will increase nightly. Full Moons occur when Earth is directly between the Sun and Moon, allowing complete illumination of the Moon's Earth-facing side.
5The Science of Moon Phases
Moon phases result from changing positions of the Sun, Earth, and Moon. The Moon doesn't produce its own light but reflects sunlight. As it orbits Earth, the portion we see illuminated changes. This cycle lasts approximately 29.5 days and consists of 8 primary phases. The Waxing Crescent is the first visible phase after the New Moon.
6The 8 Primary Moon Phases
1) New Moon: Completely dark. 2) Waxing Crescent: Thin right sliver. 3) First Quarter: Right half lit. 4) Waxing Gibbous: Mostly lit. 5) Full Moon: Fully illuminated. 6) Waning Gibbous: Light decreasing. 7) Last Quarter: Left half lit. 8) Waning Crescent: Thin left sliver. This sequence applies to Northern Hemisphere observers. Southern Hemisphere views are inverted.
7Waxing Crescent Characteristics
During the Waxing Crescent phase, the Moon appears in the western sky after sunset and sets a few hours later. The best viewing time is evening hours when the Moon reaches its highest point. The crescent's curve always faces the Sun, creating a sharp terminator line (light-dark boundary). This phase offers excellent contrast for observing surface features along the shadow line.
8Moon Observation Recommendations
For optimal Moon viewing, choose a clear night with minimal light pollution. During crescent phases, the limited illumination makes craters in dark areas more distinct. Using lunar maps helps track specific surface features. For photography enthusiasts, comparing images of the same region across different phases can yield fascinating results.
Original article: Mashable — 17 Ağustos Ay Evresi: Bugün Ay Nasıl Görünecek?