Golden hour and blue hour
Two photographers' terms, neither of which is an hour, and both of which change length dramatically with latitude and season.
Computed from standard astronomical algorithms · Reviewed Oct 2026 · Method
Golden hour is the period when the Sun is low enough that light travels a long path through the atmosphere — warm, soft, directional. The usual convention is from sunrise until the Sun reaches about 6° altitude, and from 6° back down to sunset. SkyWatch computes that boundary on every place-month page.
Blue hour is the stretch after sunset (or before sunrise) when the Sun is between about 4° and 8° below the horizon: the sky holds a deep even blue and artificial lights balance with it. It sits inside civil twilight, which the month tables label as first and last light.
Neither is an hour
The length depends entirely on how steeply the Sun crosses the horizon. Near the equator it drops almost vertically and golden hour can be under 25 minutes. In the far south in midwinter the Sun skims the horizon at a shallow angle and the same 6° takes far longer to cross — Invercargill in June gets a golden hour worth the name, while Invercargill in December has a long, slow dusk that never quite goes dark.
The practical consequence: do not plan a shoot on a rule of thumb from a northern tutorial. Look up the actual times for your place and month.