The next long period when Venus will shine as an evening star will comprise the spring and early summer of 1916. She will be at her greatest distance from the sun during the last week of April, and will not pass from view until about the first of July. Then again she will be an evening star, and so seen in the west during the autumn of 1917 and the winter of 1917–18, reaching greatest eastern elongation during the first few days of December, 1917. Her next return to the evening sky will be for the first eight months of 1919, and the next will be for the winter of 1920–21 and the spring of 1921. The synodic period of Venus is nearly five hundred and eighty-four days, or a little more than one year and seven months. That is, the planet returns to the same position with relation to the sun and the earth at intervals of about that length. The intervals do vary, however, as much as a week or more, owing to the various motions and situations of the planet and the earth. But every eight years Venus and the earth come around to almost exactly the same relative position with each other and the sun and the stars, and thus the appearances of Venus at the various seasons practically repeat themselves every eight years. The full splendor that she is to offer us in the summer of 1914 will be repeated in 1922, just as that of 1914 will but repeat that which she showed in 1906. And in each of the intervening years she will have again the same appearances that she had eight years before. With the following table as a guide, the appearances of Venus can be followed through a number of years with sufficient accuracy for any but a close student of her movements. The exact dates of elongations and conjunctions will vary a few days, but for at least two or three multiples of eight years not enough to make any material difference in her various aspects. 1913--1921--1929--1937 Greatest eastern elongation, February 12th. Inferior conjunction, April 24th. Greatest western elongation, July 3d. 1914--1922--1930--1938 Superior conjunction, February 11th. Greatest eastern elongation, September 17th. Inferior conjunction, November 27th. 1915--1923--1931 Greatest western elongation, February 8th. Superior conjunction, September 14th. 1916--1924--1932 Greatest eastern elongation, April 26th. Inferior conjunction, July 5th. Greatest western elongation, September 14th. 1917--1925--1933 Superior conjunction, April 28th. Greatest eastern elongation, December 2d. 1918--1926--1934 Inferior conjunction, February 11th. Greatest eastern elongation, April 22d. Superior conjunction, November 25th. 1919--1927--1935 Greatest eastern elongation, July 6th. Inferior conjunction, September 14th. Greatest western elongation, November 25th. 1920--1928 Superior conjunction, July 5th.