Day
Related Category: Astronomy: General
period of time for the earth to rotate once on its axis.
Day
A day is the length of time it takes a planet, satellite or other celestial body to complete one rotation on its axis.
day
Home ... Science and Technology Astronomy and Space Exploration Astronomy: General ...
Essential reading Compare
side-by-side The Oxford Dictionary of ... A Dictionary of the Bible The Columbia Encyclopedia, ...
Day (?), n. [OE. day, dai,, dei, AS. daeg; akin to OS., D., Dan., & Sw. dag, G, tag, Icel. dagr, Goth. dags; cf. Skr. dah (for dhagh ?) to burn. 69. Cf. Dawn.]
1.
Day
The day is (roughly) defined as the time required for the to complete a rotation.
Synodic day
A synodic day is the period of time it takes for a planet to rotate once in relation to the body it is orbiting (as opposed to a sidereal day which is one complete rotation in relation to the stars).
Day 1
Introduction
Students should be encouraged to discuss the definition of a cycle or periodic behavior.
This day is traditionally a religious feast
Religious festival
A religious festival is a time of special importance marked by adherents to that religion.
On The Day The Solar Wind Disappeared, Scientists Sample Particles Directly From The Sun
Courtesy NASA
(December 13, 1999) ...
Sun-Earth Day is a celebration established in 2000 by NASA and ESA. The purpose of the holiday is to popularize the knowledge about the Sun, and the way it influences life on the Earth.
[edit] See also ...
Why is there day and night?
Answer:
Clearly, when you see the Sun shining in the sky, it is day, and when you don't it is night. So the real question is "why is the Sun in the sky at some times and not at others?
Forming present day
spiral galaxies
DR EMILY BALDWIN
ASTRONOMY NOW
Posted: 08 February 2010 ...
New Images Suggest Present-Day Sources of Liquid Water on Mars
Water is the chief agent of weathering and erosion on Earth.
Because of this difference between the lunar year and the seasonal year, the quarter moon one lunar year from now (2003) won't fall on Veterans Day, but on Halloween.
Frantz talked about this in school one day. What he said gave four of his students an idea for a science project. Ashley, Katelyn, Julia and Elizabeth wondered about what might cause less snow to fall in the city.
(Already a member? Click here.)
This is a thumbnail of the Mars Book - Day, Axis, Seasons. The full-size printout is available only to site members.To subscribe to Enchanted Learning, click here. If you are already a site member, click here.
Day Numbers
Quantities that facilitate hand calculations of the reduction of mean place to apparent place.
Day, solar. The mean interval between successive meridian passages of the Sun. It is equal to 24 hours, 3 minutes and 56.55 seconds.
Day (types of)
cross-quarter ~: see cross-quarter day.
mean solar ~: measured between successive transits of the fictitious mean sun. Equal to 24 hours, it is the usual meaning of 'day' unless it is further qualified.
On day 3, the ion which started out first is at "second base," and the one which started on day 2 is at the first point out on its spoke.
One day, though, the child-Suns all went into the sky at the same time. The heat was too much, and it scorched the earth so that many people died of hunger. Yi was an archer and he tried to talk the child-Suns into coming home to no avail.
solar day The period of time between the instant when the Sun is directly overhead (i.e. at noon) to the next time it is directly overhead.
Launch Day Around one day before launch, things start to get exciting. The launch vehicle begins its fueling process and final preparations.
Modern Day
Over a century later precession was explained in Isaac Newton's Philosophiae Naturalis Principia Mathematica (1687) to be a consequence of gravitation (Evans 1998, p. 246).
Julian Day -- A unit of time within the Julian Dating System where the number of ephemeris days that have elapsed since 12h ephemeris time on January 1, 4713 B.C. JD for 1970 January 1 is 2440588.
Jeans Instability Criterion ...
DAY
A day is the length of time that it takes a planet to rotate on its axis (360°). A day on Earth takes almost 24 hours.
Day
Amount of time it takes the Earth to spin once on its axis.
Density ...
A day on Jupiter lasts less than 10 Earth hours. This means that the rotational speed of Jupiter is over 26 times faster than the Earth's. It's tremendous speed, combined with it's composition create an obleteness, flattening Jupiter by over 6%.
1 day
When the star is burning hydrogen, it is on the Main Sequence. Every other burning stage after that has the star off the Main sequence and in the area of the H-R diagram populated by Supergiants.
1 day
Si --
Fe
Figure: Cross-section of a supermassive star after the iron (Fe) core has formed. The various shells surround the iron core, each burning a different element.
A day or two after this phase, the Moon will be new again, and the cycle begins anew...
One day the hero Theseus, son of King Aegeus of Athens, came to Crete. Theseus was a strong, handsome man with many of the qualities of Heracles and was unsurpassed as a wrestler. Ariadne fell in love with him on sight.
For day-to-day operations on Memory Alpha, enforcement can be handled by the general membership. Simply pointing out each other's mistakes (politely, of course) is generally sufficient.
One day Deianeira began to suspect that Hercules was interested in another woman. So she gave Hercules a shirt on which she had spread some of the dying centaur's blood.
One day an iron-metallic meteor about 50 meters across fell from the sky, burning much brighter than the Sun, at a speed faster than 40,000 kilometers per hour (KPH).
Good day Gentelmen, I would like to get the meaning of star name Alnailum, and from withch language it came from. Many thanks Yahya
read more » messages 1 ...
Each day, the Moon travels approximately 13° along its orbit, moving from West to East in the sky. This motion causes the Moon to occult background stars.
solar day - (n.)
The synodic rotation period of the earth with respect to the sun; that is, the length of time from one local noon, when the sun is on the meridian, to the next local noon.
solar flare - (n.) ...
SOLAR DAY
A solar day is the amount of time that passes between two subsequent times when the Sun reaches its highest position above the horizon (passing through the meridian).
Event Day light / Darkness Approximate time of the year
Vernal Equinox 12 hours / 12 hours March 21
Summer Solstice longest / shortest June 21
Autumnal Equinox 12 hours / 12 hours September 21
Winter Solstice shortest / longest December 21 ...
On the day the Sun shone on the bottom of the wells in Syene, Eratosthenes measured the Sun's position in the sky over Alexandria.
On the day of the launch scientists involved in the project gathered at locations around Europe to watch the live broadcasts from Kazakhstan.
Modern day scientists purposefully limit themselves to explaining natural phenomena using only natural causes.
In this day and age having the right information is everything, and this rule seems to apply to deep sky observing as well.
present-day Italy
The Vestini tribe put the stones of Fossa in place.
~280 B.C.
To this day, the Hubble sequence is the most commonly used system for classifying galaxies, both in professional astronomical research and in amateur astronomy.
The de Vaucouleurs system ...
Go from Day Into Night, with 83 linked illustrations.
The Aurora has an explanation and images.
See aspects of the Moon at Moon Light.
Bastille Day, on July 14, is the French symbol of the end of its monarchy and the beginning of the First Republic.
Sidereal Day - The length of time (23 hours, 56 minutes, 4.091 seconds) between successive appearances of a star on the meridian
Sidereal Month - The length of time required for the Moon to return to the same apparent position among the stars ...
The seven-day system we use is based on the ancient astrological notion that the seven known celestial bodies influence what happens on Earth and that each of these celestial bodies controls the first hour of the day named after it.
Melvin S. Day, Director
Scientific and Technical Information Division
Introduction ...
Astronomy Day is an annual event intended to provide a means of interaction between the general public and various astronomy enthusiasts, groups and professionals.
A Jupiter "Day" (QuickTime (MOV) format, 2.6 Mbytes)
Jupiter and its ring system as seen from the surface of the moon Io.
Sidereal day: The time required for Earth to revolve 360o with respect to a celestial object outside the solar system. About 23 hours 56 minutes duration in terms of solar time.
The Julian Day is the number of days since the year -4712. The Julian Day begins at 12:00 Noon Greenwich mean time.
Jumbled Terrain
Strangely disturbed regions of the moon opposite the locations of the Imbrium basin and Mare Oriental ...
sidereal day
The length of time for the Earth to complete one rotation on its own axis, with respect to the stars.
sidereal month
The length of time for the Moon to complete one orbit of the Earth with respect to the background stars.
Sidereal day
the interval of time between two consecutive transits of the vernal equinox.
The average day at Uranus's equator is 17 hours, but the average day at the North and South Pole is 42 years. What, how is that possible? Well, Uranus is really drunk.I mean tilted.
Maybe one day I will too. Show me some of the best features of the Moon.
Later on the day of the explosion, police raided the Club Autonomie in London, arrested all of those inside and discovered that Bourdin had been a member of this club which had attracted mainly foreign anarchists.
 See also: Earth, Time, Light, Year, Second
|
