The Time Clues are here!
Based on the sunrise on the equinox, they'll help you estimate the longitude of the 10 Mystery sites.

Ms. Majority's 4th and 5th Grade WIN students from Prestwick STEM Academy in Little Elm ISD, Texas, celebrate longitude and latitude in this music video! Like you, they're searching for the ten secret sites too.
(Lyrics)

Photoperiod Clues from the Mystery Sites

• Clues for March 9

Compare Your Photoperiod

• Google, "sunrise [my town] March 9, 2020" and then, "sunset [my town] March 9, 2020."
• Record and Graph
• Guiding Questions

Time Clues: Estimating Longitude
Make one copy for locating each Mystery Class site.

Sunrise on the Equinox

View animation as you work. You can estimate the longitude of each mystery site with the Time Clues and these key facts:

• The Earth turns to the east as it rotates.
• It spins 1 degree longitude every 4 minutes.
• The time between sunrise at the Prime Meridian and sunrise at a mystery site on the equinox reveals approximate longitude.