Each day as its rays pass through the hole in the analemma plate below the lintel of the south trilithon, the sun casts a spot surrounded by a shadow on either the horizontal or vertical face of the two stones north of the trilithon.
During the course of a year, the locations of these spots at noon will generate a figure "8" or an "analemma." The casting of these spots on the analemma, which has been etched into the stones, provides two pieces of information—they indicate noon Central Standard Time (1 p.m. Daylight Saving Time) each day and show the day of the year. The location of the spot reaches a high point on the analemma at the winter solstice (December 21) and a low point at the summer solstice (June 21). Because the configuration does not recognize the extra day of leap years, provisions have been made in the design of the analemma plate for adjustments necessary to compensate for the difference between solar and calendar years.
Erected by University of Missouri-Rolla (now Missouri University of Science and Technology).
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Location. 37° 57.378′ N, 91° 46.593′ W. Marker is in Rolla, Missouri, in Phelps County. Marker is on Bishop Avenue (U.S. 63) 0.1 miles south of Vichy Road (County Highway 232), on the left when traveling south. The analemma is part of the interior of Stonehenge, on the Missouri S&T campus. Touch for map. Marker is at or near this postal address: 1550 North Bishop Avenue, Rolla MO 65401, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. The Polaris Window (here, next to this marker); Lunar Eclipse Predictions (a few steps from this marker); Rolla Stonehenge: A Vision Made In Stone (within shouting distance of this marker); UM-Rolla Stonehenge (within shouting distance of this marker); Pine Street and Downtown Rolla (approx. 0.4 miles away); "White" USO (approx. 0.4 miles away); Historic Site (approx. half a mile away); "Black" USO (approx. half a mile away). Touch for a list and map of all markers in Rolla.
Regarding The Analemma. Marker is part of a series of markers explaining the Stonehenge half-scale replica.
Also see . . .
1. Viewing and Understanding the Analemma (Stanford Solar Center)(Submitted on October 4, 2020, by William Fischer, Jr. of Scranton, Pennsylvania.)
2. Missouri S&T Stonehenge, ‘tis a magic place…’. (Submitted on October 4, 2020, by William Fischer, Jr. of Scranton, Pennsylvania.)
Credits. This page was last revised on October 4, 2020. It was originally submitted on October 4, 2020, by William Fischer, Jr. of Scranton, Pennsylvania. This page has been viewed 115 times since then and 27 times this year. Photos: 1, 2, 3, 4. submitted on October 4, 2020, by William Fischer, Jr. of Scranton, Pennsylvania.