Sungazing
The first and last forty-five minutes of the Sun, timed for your own horizon.
Sunset −45 min → sunset
Golden hour
This is the best time for photos and video. The sun is low, so the light is warm, shadows are long, and skin tones are well-preserved. Morning and evening.
This Morning —
This Evening —
Blue hour
For photos after the sun has set. The sky is deep blue and street lights match it, so cities and landscapes read evenly. Morning and evening.
This Morning —
This Evening —
How much Vitamin D you can make from full skin exposure for just 20 minutes at this exact time if you went outside
Melanin Matters
When the UV index is under 3, the UVB at the ground is too weak for your skin to make a useful amount of vitamin D.
SDO Sun Now
Official NASA Solar Dynamics Observatory frames. The same wall NASA uses. Refreshes every three minutes.
Read the long light
Ten articles from the Horizon tab, kept with their citations.
Elevation
Why the higher ground sees a different sky…
The Vitamin D Gradient
How Skin Pigmentation, Immune Dysregulation, and Under-Treatment Shape the Uneven Costs of Childhood Asthma and Autoimmunity…
The Season in the Blood
How Vitamin D, Daylight, and the Medicines Written First Shape Depression and Anxiety in Children and Adults…
The Photon That Remembers You
How one ultraviolet event becomes hormone, clock, mood, pressure, bone, and immunity.…
The Sun
Our 500-nanometer star is just 93 million miles away: Orbital Harvest, Lunar Industry, and the Physics of an Inverted Atmosphere…
Light through the body
The body is translucent to 850 nm. The eyes are not required for the effect.…
Heliotherapy
Sunlight as medicine for skin, bone, blood, and the clock — from ancient air and light to vitamin D, immunity, and the lamp that replaced a courtyard.…
The Factory in the Sky
A photosphere, a polar crater, and a catapult…
UV index and sunlight’s interaction with the skin, the eyes, and the brain. Why it matters.
The UV index is a sunburn meter, not a mood. The World Health Organization sets it at 40 times the sunlight left after the McKinlay–Diffey erythema curve. Index 1 is 25 m…
Index 8, Reported Lower
Sunglasses tell the brain the ultraviolet is less than the sky. Skin protection is issued for the lower report.…
Next showers
A horizon window is a limit on when a direct look is even discussed. It is not a finding that the fovea is built for fixation.— First Light: The Safe Hour
Cycles · $11.11
Get access to the Cycles tab for an $11.11 one-time charge. Explore stays free.
One time, no drip. Cycles is the almanac that keeps the living Sun, incoming plasma, and your own horizon on one desk. One-time charge. No recurring payment. No subscription. Card, Apple Pay, Google Pay, and Cash App.
Give to the work
Aurelia is kept by a nonprofit. Any gift supports us and the people we serve.
Cash App · $SungazingApp