Pluto Time at the Bergius Botanic Garden

Pluto Time at the Bergius Botanic Garden

Biking to the Bergius Botanic Garden[a], getting there right about "Pluto time"[b].

Since I didn't find the Pluto time webpage[c] until two days after, I did some calculating with Stellarium[d]: Pluto time, as defined by NASA (as can be seen in the source code for the Pluto Time webpage), is when the sun's apparent altitude is 1.5 degrees below the horizon. Since NASA and Stellarium use different atmospheric models (to account for light bending through the atmosphere), -1.5 degrees for NASA is approximately -1±0.2 degrees in Stellarium. Given that the surface illumination is dependent on other factors I think I'm "close enough for government work". (Now you know why I don't work for NASA and never will.)

2015-06-15 22:08

Bergianska Trädgården

This is the view at "Pluto Time".

2015-06-15 22:16


Bergianska Trädgården