The Earth’s albedo, as the fraction of sunlight that is directly reflected back into space from the surface or clouds, is a key factor in modeling Earth’s climate. In tasks such as the simplified estimation of the mean temperature, it is usually given as a constant, without mentioning its determination and the associated difficulties. In fact, the albedo can be determined by a basically simple procedure based on the observation of a well-known phenomenon: Earth’s shine. A comparison of the intensities between the directly illuminated side of the Moon and the side illuminated by Earth’s shine provides the mean albedo for a large part of the Earth’s surface. In this paper, the procedure will be reproduced using simple instruments. Assuming the reflection properties of a Lambert sphere—an ideal diffuse reflecting body—for the Earth, and using measurements of the phase function—as a description for the angular distribution of the scattered light—of the Moon, the Earth’s albedo is determined from self-acquired data. Even with these simple conditions it is possible to come quite close to the value of the Earth’s albedo.

地球的反照率是从地表或云层直接反射回太空的太阳光的一部分，是模拟地球气候的关键因素。在诸如平均温度的简化估计之类的任务中，它通常作为常数给出，而没有提及它的确定和相关的困难。事实上，反照率可以通过一个基本简单的程序来确定，该程序基于对一个众所周知的现象的观察：地球的闪耀。月球直接照射侧和地球光照射侧之间强度的比较提供了地球表面大部分区域的平均反照率。在本文中，将使用简单的仪器重现该过程。假设地球的朗伯球体（一种理想的漫反射体）的反射特性，并使用月球相位函数的测量值（作为散射光角分布的描述），地球的反照率是根据自行获取的数据确定的。即使在这些简单的条件下，也有可能非常接近地球的反照率值。