Astronomical Information Center. United States Naval Observatory. Archived from the original on 25 May Retrieved 9 July On the day of an equinox, the geometric center of the Sun's disk crosses the equator, and this point is above the horizon for 12 hours everywhere on the Earth. However, the Sun is not simply a geometric point. Sunrise is defined as the instant when the leading edge of the Sun's disk becomes visible on the horizon, whereas sunset is the instant when the trailing edge of the disk disappears below the horizon. These are the moments of first and last direct sunlight.
At these times the center of the disk is below the horizon. Furthermore, atmospheric refraction causes the Sun's disk to appear higher in the sky than it would if the Earth had no atmosphere.
Thus, in the morning the upper edge of the disk is visible for several minutes before the geometric edge of the disk reaches the horizon. Similarly, in the evening the upper edge of the disk disappears several minutes after the geometric disk has passed below the horizon. The times of sunrise and sunset in almanacs are calculated for the normal atmospheric refraction of 34 minutes of arc and a semidiameter of 16 minutes of arc for the disk.
In Urban, S.
Explanatory supplement to the astronomical almanac 3rd ed. Astronomical Almanac Time and Date. Retrieved 22 May Goddess Alive! Llewellyn Worldwide. Orbital Mechanics for Engineering Students.
Astronomy Calendar of Celestial Events - Sea and Sky
Grewal; Lawrence R. Weill; Angus P. Andrews Paradise Cay Publications. Allied Publishers. Marion Street Press. Oxford University Press. Krishna Prakashan Media. Ecological Modelling. Kenneth, ed.
Full & New Moons
Explanatory Supplement to the Astronomical Almanac. Retrieved 22 September Math Encounters blog. Dark Sky Diary blog. Retrieved 31 December Glossary Chapter.
Personally Significant Days
Mathematical Astronomy Morsels. Astronomical Algorithms, Second Edition.
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Or, that could make them all the more meaningful—it's up to you to decide. If you're die-hard sports fans—or if you're worried your guests might have a hard time choosing between your wedding date and the big game—avoid getting married during popular sporting events.
And if a lot of your guests come from the same alma mater, watch out for homecoming weekends and bowl games that might conflict. If you're superstitious, you might want to watch out for these historically inauspicious days from across several cultures when selecting your wedding date. For ancient Romans, an "ides" was simply a date that marked the middle of the month—until Julius Caesar was assassinated on March 15 in 44 BC.
Since then, "Beware the Ides of March" has become the mantra of this superstitiously unlucky date. The unluckiest date of the year has questionable origins.
Some historians say it comes from the 13 diners who were present at the last supper, but the famous Babylon's Code of Hammurabi doesn't include a 13th law, which suggests this superstition is as old as BC. And it wasn't until a successful novel titled Friday, the Thirteenth was published in the early s that Friday became part of the unlucky equation. Greeks and Romans thought starting any new life event—from getting married to baptizing a child—in a leap year would bring bad luck.
Wedding Dates to Avoid in , and Ready to set a date? Select a Western date and convert it to its Chinese lunar equivalent. You are generally okay this week, that is, money comes quickly and spends fast. So, pay more attention. Although there are occasionally some small pro Once wearing a lucky charm, one especially those clash with Tai Sui in the year will be blessed with good luck in the year. Different stones have different effects on your fortune. Popular Topics Chinese Horoscope.
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