随着月亮在地球轨道上运行，我们正迎来下一个月相。在经历了上周的新月后，月亮正逐渐显现。今晚的月相是峨眉月（Waxing Crescent），月亮有39%被照亮。即使不借助任何设备，也能看到月海（Mare Crisium, Mare Fecunditatis, Mare Serenitatis）。借助双筒望远镜，可以看到更多的细节，如恩底弥翁撞击坑（Endymion Crater）和月海（Mare Nectaris, Posidonius Crater）。使用望远镜，甚至可以观测到阿波罗11号和17号的着陆点，以及与埃菲尔铁塔高度相仿的火山穹顶——情人节穹顶（Valentine Dome）。下一个满月将在11月5日出现。

🌙 今晚的月相为峨眉月（Waxing Crescent），月亮约有39%的区域被照亮。这是新月之后，月亮逐渐回归可见状态的阶段。在没有辅助设备的情况下，肉眼即可观测到月海，如月海（Mare Crisium）、月海（Mare Fecunditatis）和月海（Mare Serenitatis）。

🔭 借助光学设备，观测细节将更加丰富。使用双筒望远镜，可以清晰地看到恩底弥翁撞击坑（Endymion Crater）、月海（Mare Nectaris）和波塞冬尼乌斯撞击坑（Posidonius Crater）。若使用望远镜，则能进一步观测到阿波罗11号和17号的着陆点，以及被昵称为“情人节穹顶”的火山穹顶，它因形似心形而在特定光线下被如此命名，其高度与埃菲尔铁塔相当。

🌕 月相变化是由于月球绕地球运行，太阳、月球和地球之间角度变化所致。月球周期为29.5天，期间会经历新月、峨眉月、上弦月、盈凸月、满月、亏凸月、下弦月和残月等八个主要阶段。当前，月亮正处于从新月向满月过渡的增长阶段。

We're a day away from another lunar phase which can mean one thing; the moon is almost half back to us. After last week's New Moon, it's been slowly coming back. And there is lots to find out and see with tonight's moon.

What is today’s moon phase?

As of Tuesday, Oct. 28, the moon phase is Waxing Crescent. There will be 39% of the moon lit up tonight, according to NASA's Daily Moon Observation.

Without any visual aids, tonight you should be able to see the Mare Crisium, the Mare Fecunditatis, and the Mare Serenitatis. With a pair of binoculars you'll see even more, including the Endymion Crater, Mare Nectaris and the Posidonius Crater. By adding a telescope to your set up, you should also be able to spot the Apollo 11 and 17 landing spots, as well as the Valentine Dome, a volcanic dome NASA tells us is almost the same heigh as the Eiffel Tower. It’s nicknamed the Valentine because it looks like a heart in certain lights

When is the next full moon?

The next full moon will be on Nov. 5.

What are moon phases?

NASA explains that the moon goes through phases as it completes its 29.5-day orbit around Earth. The changing angles between the Sun, Moon, and Earth cause the different phases we observe. From Earth, the moon can look full, partially lit, or even disappear entirely, but we always see the same side. What changes is the amount of sunlight reflected from its surface, depending on its position in orbit.

The eight main moon phases are:

New Moon - The moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).

Waxing Crescent - A small sliver of light appears on the right side (Northern Hemisphere).

First Quarter - Half of the moon is lit on the right side. It looks like a half-moon.

Waxing Gibbous - More than half is lit up, but it’s not quite full yet.

Full Moon - The whole face of the moon is illuminated and fully visible.

Waning Gibbous - The moon starts losing light on the right side. (Northern Hemisphere)

Third Quarter (or Last Quarter) - Another half-moon, but now the left side is lit.

Waning Crescent - A thin sliver of light remains on the left side before going dark again.