https://www.washingtonpost.com/weather/2022/03/17/daylight-saving-time-sunrise-sunset/
The rounded upper-right legend is:
"Time of the latest sunrise of the year if daylight saving time is made permanent"
Darkest - top = 10AM or later
Decreasing in 30 minute increments
Lightest - bottom = 7:30 - 8:00 AM
"Note: Sunrise times calculated based on the centerpoint of each county." - So that's why the shadow boundaries aren't smooth.
HTH!
Cheers,
Scott.
The rounded upper-right legend is:
"Time of the latest sunrise of the year if daylight saving time is made permanent"
Darkest - top = 10AM or later
Decreasing in 30 minute increments
Lightest - bottom = 7:30 - 8:00 AM
"Note: Sunrise times calculated based on the centerpoint of each county." - So that's why the shadow boundaries aren't smooth.
HTH!
Cheers,
Scott.