The change in length of daylight between today and tomorrow is also listed when available. The time of Actual Sunset minus the time of Actual Sunrise. The time of Civil Sunset minus the time of Civil Sunrise. In the beginning of morning astronomical twilight and at the end of astronomical twilight in the evening, sky illumination is very faint, and might be undetectable. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening. The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. Ordinary outdoor activities are not possible at this time without extra illumination. The horizon is well defined and the outline of objects might be visible without artificial light.
The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. Tuesday: Partly cloudy and warm with a high of 85 degrees. One still should be able to carry on ordinary outdoor activities. Here's a day-by-day breakdown, according to Weather Underground. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. The time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset.
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