Kuna uwezekano masaa ya usiku huenda harakaharaka kuriko mchana kwa mifano ifuatayo;
1. Mtu anayelala masaa 6 mchana huchoka na kukinai usingizi kabisa kuriko mtu anayelala masaa 12 usiku ambapo bado anaweza onekana kutamani usingizi!
2. Ni rahisi kukesha usiku kuriko kushinda mchana!
Je; ni kweli? Wataalam ebu nisaidieni kunipa ufafanuzi hapa!
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Updates!
More Than 12 Hours
On the equator, the day and night stay approximately the same length all year round, but the day will always appear a little longer than 12 hours, due to the reasons below.
On the equinoxes, the geometric center of the sun is above the horizon for 12 hours, and you might think that the length of the day (hours of daylight) would be 12 hours too.
However, ‘sunrise’ is defined as the moment the upper edge of the sun's disk becomes visible above the horizon – not when the center of the sun is visible. In the same sense, ‘sunset’ refers to the moment the Sun's upper edge, not the center, disappears below the horizon. The time it takes for the sun to fully rise and set, which is several minutes, is added to the day and subtracted from the night, and therefore the equinox day lasts a little longer than 12 hours.
Refraction: Light Lingers
Another reason why the day is longer than 12 hours on an equinox is that the Earth's atmosphere refracts, sunlight.
This refraction, or bending of the light, causes the Sun’s upper edge to be visible from Earth several minutes before the edge actually reaches the horizon. The same thing happens at sunset, when you can see the sun for several minutes after it has actually dipped under the horizon. This causes every day on Earth – including the days of the equinoxes – to be at least 6 minutes longer than it would have been without this refraction.
1. Mtu anayelala masaa 6 mchana huchoka na kukinai usingizi kabisa kuriko mtu anayelala masaa 12 usiku ambapo bado anaweza onekana kutamani usingizi!
2. Ni rahisi kukesha usiku kuriko kushinda mchana!
Je; ni kweli? Wataalam ebu nisaidieni kunipa ufafanuzi hapa!
*******************
Updates!
More Than 12 Hours
On the equator, the day and night stay approximately the same length all year round, but the day will always appear a little longer than 12 hours, due to the reasons below.
On the equinoxes, the geometric center of the sun is above the horizon for 12 hours, and you might think that the length of the day (hours of daylight) would be 12 hours too.
However, ‘sunrise’ is defined as the moment the upper edge of the sun's disk becomes visible above the horizon – not when the center of the sun is visible. In the same sense, ‘sunset’ refers to the moment the Sun's upper edge, not the center, disappears below the horizon. The time it takes for the sun to fully rise and set, which is several minutes, is added to the day and subtracted from the night, and therefore the equinox day lasts a little longer than 12 hours.
Refraction: Light Lingers
Another reason why the day is longer than 12 hours on an equinox is that the Earth's atmosphere refracts, sunlight.
This refraction, or bending of the light, causes the Sun’s upper edge to be visible from Earth several minutes before the edge actually reaches the horizon. The same thing happens at sunset, when you can see the sun for several minutes after it has actually dipped under the horizon. This causes every day on Earth – including the days of the equinoxes – to be at least 6 minutes longer than it would have been without this refraction.
