annular

Porokeratosis is a skin disease that leads to the development of annular or circular, red and itchy lesions.

I have an assortment of neutral density filters because I had previously photographed an annular eclipse, when the moon is farther away in its Earth orbit and therefore doesn’t block the entirety of the sun.

She had seen many eclipses before today, two totals, one annular and two partials.

Further examination of the radially polarized beam behavior when focused with an annular shape revealed that the longitudinal field is greatly enhanced.

In a total eclipse, the Moon fully blocks the Sun from Earth view, while during an annular eclipse, a narrow ring of sunlight can be seen encircling the Moon.