Why are moonless clear nights at the latitude of Moscow the darkest in April and early May?

To answer the question, you need to remember that not all parts of the starry sky shine equally brightly. The bright strip of the Milky Way, consisting of a huge number of stars, passes through the sky. The number of bright stars near the Milky Way is also increasing. On summer, autumn and winter nights, the Milky Way is visible at the latitude of Moscow as a large arc passing through the entire sky at a high altitude above the horizon (in the fall – even through the zenith). But in spring, the Milky Way passes low over the northern horizon and is hardly visible. The sky at this time is much darker. It should also be taken into account that in March the sky is noticeably illuminated from the surface of the Earth, which is still covered with snow (especially near large cities), and from mid-May the nights become brighter, since the Sun does not sink deep under the horizon. As a result, it turns out that the darkest night moonless sky is in April and early May.

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