NovelNumbers

Golden hour: the period when the sun's elevation is between −4° and +6° above the horizon — the standard photography convention. Morning golden hour begins slightly before sunrise and ends once the sun climbs past 6°; evening golden hour begins when the sun drops below 6° and ends slightly after sunset. All times account for daylight saving transitions automatically for the selected time zone. Photography tip: shoot with the sun behind or to the side of your subject for warm, directional light and long, soft shadows — backlighting during this window also makes for flattering, rim-lit portraits.

Blue hour: the period when the sun is between −4° and −8° below the horizon. The sky takes on a deep, saturated blue as the last warm light fades, while artificial lights — streetlights, building windows, illuminated signs — reach a natural balance with the remaining daylight rather than looking blown-out or dim. Photography tip: this is prime time for cityscapes and architecture — use a tripod and a slightly longer exposure to let the blue sky and artificial lights sit evenly in the same frame, an effect that's hard to get right at any other time of day.

Civil twilight: the period when the sun is between 0° and −6° below the horizon. There's usually enough natural light to see clearly outdoors without artificial lighting, and on clear days the horizon is still visible. Photography tip: still bright enough to shoot handheld in most conditions — good for silhouettes against the brighter sky near the horizon, or for capturing the color gradient right after sunset or before sunrise.

Nautical twilight: the period when the sun is between −6° and −12° below the horizon. The horizon is no longer clearly visible, but general shapes and the brightest stars and planets become visible — historically used by sailors for celestial navigation. Photography tip: exposures get long enough that a tripod becomes necessary; a good window to start planning star trails or early astrophotography, though some ambient light will still wash out the faintest stars.

Astronomical twilight: the period when the sun is between −12° and −18° below the horizon. The sky is essentially dark to the naked eye, though residual sunlight can still faintly affect the faintest astronomical observations. Once the sun drops below −18°, it's considered full night. Photography tip: dark enough for serious night-sky photography — for Milky Way shots or deep-sky astrophotography, waiting until this phase ends (full night) minimizes residual sky glow.