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  1. Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States.Lowell Observatory was established in 1894, placing it among the oldest observatories in the United States, and was designated a National Historic Landmark in 1965.

  2. Since 1958, initially under the direction of Charles Keeling, followed by his son Ralph and later Elmer Robinson, Mauna Loa Observatory (MLO) has been monitoring and collecting data relating to atmospheric change, and is known especially for the continuous monitoring of atmospheric carbon dioxide (CO 2), which is sometimes referred to as the Keeling Curve.

  3. Sofía es la capital y la ciudad más grande de la República de Bulgaria.Con una población de 1 269 384 habitantes en 2018, se trata de la 14.ª mayor ciudad de la Unión Europea, donde ingresó en enero del 2007, y alrededor de 1.380.406 en su área metropolitana, la Provincia Capital. [3]

  4. Tbilisi Observatory ... Wikipedia® es una marca registrada de la Fundación Wikimedia, Inc., una organización sin ánimo de lucro. Política de privacidad;