EME 810
Solar Resource Assessment and Economics

2.8 Discussion Activity


Continuing Conversations in Yellowdig!

I hope you are getting the hang of Yellowdig conversation platform and are ready to pick up the pace! You can access the discussion platform through the Canvas menu.

Lesson 2 Discussion: Reflection on Time Conversions

For this week, I would like you to question why we do all of these time conversions for solar energy. Why do we need to know these time and angle relations as solar energy specialists? There are many terms and concepts to reflect on – some are well-known, and some may be new to you. In this discussion you will have a chance to reflect on the meaning and your understanding of those and perhaps some of your peers’ interpretations of those concepts will be helpful to your comprehension of this lesson. Here are some guiding questions you may use as starting points for your posts:

  • What is the difference between Solar time vs. Clock time? Is that important, significant, and should we bother?
  • Analemma, what is it representing, and how it affects the solar time?
  • What is longitudinal time correction?
  • Daylight savings - what insight have you gained about the use of daylight savings in society? Is it useful, not so much, meh?
  • What are equinox and solstice's role in solar resource forecasting? These are key, critical points in time. What makes them special?

This is an open-ended discussion, and you may ask questions or raise your concerns with things that might still remain confusing. Feel free to post and comment on any of the above-listed topics and whatever you want to share after working through the lesson material.


Yellowdig Tip: When you create a post in the Yellowdig discussion space, you are required to choose a topic tag. For Lesson 2 discussions, use any of the following:

Tags: "Solar time vs. Clock time", "Analemma and Longitudinal Corrections", "Daylight Savings", "Solstices and Equinoxes"

Know that you can tag your post with one or several of these topics depending on its content. It gives you flexibility to discuss these things cumulatively or, if you prefer, to break your writing into several smaller posts.

Importance of interaction

Once again: the more you participate, the more opportunities for your discussion score to grow through the week. Comment, ask questions, react, throw in additional thoughts – it all is in your benefit!


Yellowdig points you earn over the weekly point earning period (from Saturday to next Friday) will count towards 1000 pts. weekly target. But you can go above it (to 1350 pts. max) if you are feeling active. That may help you to make up for some low-activity weeks. Yellowdig discussions will account for 15% of the total grade in the course. Check back the Orientation Yellowdig page in Canvas for more details on the points earning rules.


There is no hard deadline for participating in these discussions, but I encourage you to create your posts in the middle of the study week (Sunday) to allow others to engage and respond while we are learning specific topics in the lesson.