Alan Gibson Archives - The Natural Navigator

The Sorting by Sea Currents

October 29, 2019October 29, 2019

Sea currents sort objects according to size, shape and weight. There is a documented case of left Wellington boots from a lost container washing up…

May 24, 2019May 24, 2019

My thanks to Alan Gibson, urbane forager and regular contributor to this blog, for another great image. In this picture we are looking at two…

January 22, 2018March 24, 2020

Here is a lovely example of Heiligenschein, or ‘halo effect’. When a bright light source is directly behind us, we see a brighter ring around…

July 15, 2016November 26, 2018

My thanks again to Alan Gibson for sending over some great images. These are sun dogs or parhelia and parts of a “22 degree halo”.…

April 21, 2016November 26, 2018

My thanks to Alan Gibson, author of the Urbane Forager blog and book, for sending me these great images of a contrail shadow. (Contrails are…