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за май 2004 года.
Serenitatis Diameter Sequence
1.05.2004 | Лунное фото дня
Have you heard of the North Polar Sequence? It is a series of 96 stars near Polaris whose brightnesses and colors were accurately determined as standards for stellar astronomers. There has not been a comparable standard sequence that would permit lunar observers to judge their observing conditions, telescopic performance, visual acuity or imaging limits.