Anza-Borrego Desert State Park - Kevin Key Photography - San Diego, California
Old Railroad Water Tower and 22° Moon Halo at Dos Cabezas Siding in the Anza-Borrego Desert

Old Railroad Water Tower and 22° Moon Halo at Dos Cabezas Siding in the Anza-Borrego Desert

The water tower seen here is part of the SD&AE and dates back to the age of steam locomotives.

The San Diego & Arizona Eastern Railway Company is a short-line American railroad originally founded in 1906 as the San Diego & Arizona Railway (SD&A) by sugar heir, developer, and entrepreneur John D. Spreckels. Dubbed "The Impossible Railroad" by many engineers of its day due to the immense logistical challenges involved, the line was established in part to provide San Diego with a direct rail link to the east by connecting with the Southern Pacific Railroad lines in El Centro, California. The SD&A's 146.4-mile (235.61 km) route originates in San Diego, California and terminates in El Centro, California. Recently, the Baja California Railroad has taken out a lease of this line and plans to restore freight service in the near future.

A 22° halo is a halo, one type of optical phenomenon, forming a circle 22° around the sun, or occasionally the moon. It forms as sunlight is refracted in hexagonal ice crystals suspended in the atmosphere. As the light beam passes through two sides of the prism forming a 60° angle, the angle of minimum deviation is almost 22° (namely, 21.84° on average; 21.54° for red and 22.37° for blue). This wavelength-dependent variation in refraction causes the inner edge of the circle to be reddish while the outer edge is bluish. A 22° halo may be visible on as many as 100 days per year.

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