Mystery Class Update: March 13, 2015

Mystery Class

Mystery Class Update, March 13, 2015
By Julie Brophy

Time Clues are here! Use equinox sunrise times to estimate the longitude of Mystery sites.

Video of the Week

Longitude Rap

Clues: Week #7

Mystery Classes Photoperiod Data

Local Photoperiod Data

Resources

Report Photoperiod

Time Clues: Estimating Longitude

Make one copy for locating each Mystery Class site.

Time Clues Sunrise on the Equinox	Worksheet Step-by-step guide	Map Plot east/west location
Sunrise on the Equinox	View animation as you work. You can estimate the approximate 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.
Sample Worksheets for Practice

Sample A West of Greenwich	Sample B East of Greenwich	Sample C Farther east of Greenwich

Next Update March 20, 2015