Right ascension is the angular distance from the vernal equinox measured on the equator.
Hence, if we note the interval of time between the passage of any two stars, as shown by the clock, we have a measure of the number of degrees by which they are distant from each other in right ascension.
Certain stars near the same parallel of declination as the moon, and not differing greatly from her in right ascension, given in the Ephemeris as proper objects for comparison with her, to determine the longitudes of places.
Is the moon in conjunction with the sun at the time of new moon, both luminaries having then the same longitude, or right ascension.
First there will be the star's name, and in the next column its magnitude, and in a third the star's right ascension.
If there were still stars left in a constellation unnamed, numbers were used, first by Flamsteed, Astronomer Royal; and numbers in the order of right ascension in various catalogues are used to designate hundreds of other stars.
On the whole the great amount of research that has been devoted to the solar motion relative to the system of the stars for the past hundred years may be said to indicate a point in right ascension 18h.
The slow motion in right ascension is of Grubb's form,[10] and the telescope has two slightly different rates, according to whether the loose wheel is stopped or allowed to turn freely.
For the reasons indicated above, the force required to move the telescope in right ascension is perhaps five times greater than it should be.
With a little practice, however, one can wind the clock without actually stopping it, though the object must afterwards be brought back to its place by means of the slow motion in right ascension.
Subtract the clock time from the right ascension (plus 24 if necessary) and set the hour circle to the result.
A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated in hours and subdivisions of hours of right ascension.
If a planet then is in right ascension (usually printed for short R.
The entire circuit of the heavens along the equator is divided into twenty-four hours of right ascension, each hour covering 15° of space.
The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope.
Does the apparent motion of a star change its declination or right ascension?
Right ascension is always measured from the vernal equinox in the direction opposite to that in which the stars appear to travel in their diurnal motion--i.
Instead of latitude the astronomer says declination, in place of longitude he says right ascension, in place of meridian he says hour circle, but he means by these new names the same ideas that the geographer expresses by the old ones.
Instead of reckoning a star's right ascension by referring it to the equator, it was reckoned by observing the degree of the zodiac which southed along with it.
Motion in longitude is not the same thing as motion in right ascension.
The modern method is to call the co-ordinates right ascension and declination, if reckoned from the equator, and longitude and latitude, if from the ecliptic.
There are, therefore, nine entries to make for one position of a star in declination, and ten for one position of a star in right ascension.
But a difficulty at once confronts us--Where can we fix our 'right ascension nought'?
Distance in a direction parallel to the equator is termed 'right ascension,' corresponding to terrestrial longitude.
The first four volumes of this work are now published and contain the first twelve hours of right ascension, so that half the work is now printed.
It should be remembered that the first four figures give the hour and minutes in right ascension, the last two the declination, italics showing negative declination.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "right ascension" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
