Here you will find the course calendar (below) and LabArchives link containing course assignments. Click the "+ Google" button at the bottom right of the calendar to add the calendar to your google account and set it up for phone or email reminders. Alternatively, you can follow @mrvernonied on the Twitters and it will auto-Tweet a reminder to you the day before.

Tuesday, July 4, 2017

Aphelion Sunrise


On July 3rd, planet Earth reached aphelion, the farthest point in its elliptical orbit around the Sun. Each year, this day of the most distant Sun happens to occur during winter in the southern hemisphere. That's where this aphelion sunrise from 2015 was captured in a time series composite against the skyline of Brisbane, Australia. Of course, seasons for our fair planet are not determined by distance to the Sun, but by the tilt of Earth's rotational axis with respect to the ecliptic, the plane of its orbit. Fondly known as the obliquity of the ecliptic, the angle of the tilt is about 23.4 degrees from perpendicular to the orbital plane. So the most distant sunrise occurs during northern summer, when the planet's north pole is tilted toward the Sun and the north enjoys longer, warmer days. via NASA http://ift.tt/2ulvNQp