On times and shadows: the observational analemma

27 Dec 2018 Gangui Alejandro Lastra Cecilia Karaseur Fernando

The observation that the shadows of objects change during the course of the day and also for a fixed time during a year led curious minds to realize that the Sun could be used as a timekeeper. However, the daily motion of the Sun has some subtleties, for example, with regards to the precise time at which it crosses the meridian near noon... (read more)

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  • PHYSICS EDUCATION
  • INSTRUMENTATION AND METHODS FOR ASTROPHYSICS
  • HISTORY AND PHILOSOPHY OF PHYSICS
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