Summer Solstice

Today in Edmonton there is 3 more seconds of daylight than yesterday, and tomorrow will have 2 seconds fewer daylight than today. 3:43pm today (by no minor coincidence, the time of this post) represents the technical Summer Solstice.

It's worth noting the solstice can be different than the longest day of the year: when the solstice happens between midnight and 6am (for those who are confused, the curvature of the earth doesn't care about whether or not the sun is visible at your specific point on the globe) the longest day of the year is technically the day before because less than 1/4 of the day daylight is getting longer and 3/4 of the day daylight is getting shorter. Similarly, when the solstice falls between 6pm and midnight the first few hours of the day are further from the solstice than the first few hours of the next day.

However, the longest day of the year is not tomorrow. That will be important later.