The Colour and Shape of Navigation Marks
Most navigators, even inexperienced ones, learn that colours are important when trying to identify navigation marks at sea. And most people also know that there…
Tag: colour
What are Supernumerary Rainbows?
Supernumerary rainbows are faint bow lines that appear just inside the main rainbow. Look at the rainbow above and you may just be able to…
Hydrangeas – Nature’s Litmus Test
Hydrangeas are nature’s litmus test, by which I mean they can tell us the pH of the soil they are growing in. There are actually…
How to Navigate with Rainbows
Many people believe that a thing must be either beautiful or practical. But nature brims with examples that manage both. Rainbows are pretty, but they…
The Difference Between Sunrise and Sunset
Have a look at this photo and see if you can tell whether it is a sunrise or sunset? Yes, it’s tricky. Sunrises and sunsets…
