Clues for Spring 2019

Photoperiod

Time Continent, Country, City

Use photoperiod to estimate latitude. Calculate photoperiod using sunrise/sunset data.

Mystery Class Data

Sunrise/sunset data from the 10 Mystery sites will be posted here weekly on these dates. Record and graph the photoperiod for each site.

 

Your Local Data

Look up your own sunrise/sunset for the dates above. Calculate, record and graph your photoperiod. How does it compare to the Mystery Sites?

 

 

Use Time Clues to estimate longitude:

  • March 11

Narrow the search from continent to country to city. Clues will be posted weekly on these dates.

  • March 17 (continent/region)
  • March 24 (country)
  • March 31 (state/province)
  • April 7 (city/town)