• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Hariprasad comes from well known Jyotish family in Andhrapradesh
Hariprasad comes from well known Jyotish family in Andhrapradesh

... through Lagadha Mahamuni. (There is a view that it was authored by Lagadha Mahamuni. But upon close reading “Lagadhasya Mahatmanah” does not give that interpretation). This is the oldest Hindu Astronomical Text (full text not available – only some portions are available). Surya Sidhantha is the seco ...
RELATION BETWEEN LONGITUDE AND TIME
RELATION BETWEEN LONGITUDE AND TIME

...  Celestial sphere – a hollow sphere/imaginary globe of infinite radius of which the earth is the center  Celestial poles – are the points where the earth’s axis prolonged pierces the celestial sphere  Zenith – the point where a vertical line pierces the celestial sphere above the head of the obse ...
ASTR 111 Lab Manual - Ohio Wesleyan University
ASTR 111 Lab Manual - Ohio Wesleyan University

... The latitude of a point is the angle as seen at the center of the Earth between that point and the equator. Note that we must specify whether the point lies north or south of the equator, which we do by appending “N” or “S” to the angle. The north pole has latitude 90º N, while the south pole has la ...
Slide 1
Slide 1

... LMC is falling in for the first time. And it only took a couple of years between epochs. In passing, what we gain is the superb precision. The good measurement is only different from the ground-based by 1.5x the error in the ground-based (errors in ground-based are large, too large). Well, wouldn’t ...
Latitude and Longitude - Northside Middle School
Latitude and Longitude - Northside Middle School

... Always rises at sunset and sets at sunrise Is located over Earth’s axis of rotation Can be seen from any place on Earth Is a very bright star ...
Small images
Small images

... Due to the interaction of an earth that is not perfectly spherical with the gravitational pull of the sun and moon ...
AN INTRODUCTION TO THE STARS AND CONSTELLATIONS
AN INTRODUCTION TO THE STARS AND CONSTELLATIONS

... Note: Constellation names can be obtained through Toggle Labels on the menu bar, and constellation lines can be accessed through Show Constellation Figures on the menu bar. Note any specific or prominent stars that may be a part of the constellations. You can identify the stars by a single-click of ...
what is your position?
what is your position?

... a sextant by observing the sun and with the time in Greenwich on his watch. For example, when the sun is one hour later at its highest point than the Greenwich time, the navigator can be sure that he is 60 minutes divided by 4 minutes per degree, i.e. 15 degrees longitude West of Greenwich. A deroga ...
Celestial Equator
Celestial Equator

... Precession of the Equinoxes ...
File - Flipped Out Science with Mrs. Thomas!
File - Flipped Out Science with Mrs. Thomas!

...  Rotates on an axis  Revolves around a star We have named several phenomenon beyond seasons. However, these also occur in predictable cycles. ...
To Measure the Sky: An Introduction to Observational Astronomy.
To Measure the Sky: An Introduction to Observational Astronomy.

... find themselves in the same situation as the shepherd. A constant theme throughout astronomy is the problem of the third dimension, the r-coordinate: the directions of objects are easily and accurately determined, but their distances are not. This prompts us to use coordinate systems that ignore the ...
naap_motion1_sg
naap_motion1_sg

... This view shows the earth as seen from the sun. It gives the best view of the subsolar point – the location on the earth where the direct rays of the sun are hitting. The noon observer’s location on the Earth is indicated by a red parallel of latitude which can be dragged to new latitudes (this affe ...
The Geographic Position of a Celestial Body
The Geographic Position of a Celestial Body

... Interactive Computer Ephemeris, ICE, is a computer almanac developed by the U.S. Naval Observatory (successor of the Floppy Almanac). ICE is FREEWARE (no longer supported by USNO), compact, easy to use, and provides a vast quantity of accurate astronomical data for a time span of almost 250 (!) year ...
Lab 1: The Celestial Sphere
Lab 1: The Celestial Sphere

... lines. The small yellow ball represents the Sun, and the movable ring around the Earth represents the horizon. 2. The point where the rod holding the Earth hits the bottom of the outer globe is the south celestial pole. Opposite to this is the northern celestial pole. These are simply extensions of ...
03jan13.ppt - Institute for Astronomy
03jan13.ppt - Institute for Astronomy

... Seasonal Change in Sun’s Altitude • The “Figure 8” shows Sun at same time each day over a year. ...
The Accurate Barycentric Corrections for the Detection of Extrasolar
The Accurate Barycentric Corrections for the Detection of Extrasolar

... In Fig. 1 there is the graphical representation of the differences in radial–velocity corrections between the programs BarCor and Brvel. One can see that the maximum difference occurs near the celestial equator (declination close to −10◦ ) and right ascension near 22–23 h. These differences correspo ...
Section2_Coordinates.. - Faculty Web Sites at the University of Virginia
Section2_Coordinates.. - Faculty Web Sites at the University of Virginia

... arcsec/year, or mas/yr (arcsec/century). - largest proper motion known is that of Barnard’s star 10.3”/yr; typical ~ 0.1”/yr - relative proper motions; wrt a non-inertial reference frame (e. g., other more distant stars) - absolute proper motions; wrt to an inertial reference frame (galaxies, QSOs) ...
mean solar day
mean solar day

... •View from the vantage point of above the North Pole •Earth rotates counter-clockwise, from west to east •View from people on Earth •Stars rotates clockwise, from east to west ...
Eratosthenes Determines the Size of the Earth in about 200 B.C.
Eratosthenes Determines the Size of the Earth in about 200 B.C.

... seen from Earth The Ecliptic •  Because of the tilt of the Earth's rotation axis, the Sun seems to travel on a path on the celestial sphere, the “ecliptic”, which is tilted 23.5° with respect to the celestial equator. •  It appears to us that the Sun travels around the Celestial Sphere once a year. ...
4. Survey Observations
4. Survey Observations

... (~March 20-21), when the Sun will have RA = 0h0m0s, (and so 12h0m0s will be up in the middle of the night) – On ~April 20, ~14h is up in the middle of the night ...
Maya .(English)
Maya .(English)

... After heliacal rise, Venus rises before the sunrise: morning star. After superior conjunction, Venus rises after the sunrise, so set after the sunset: evening star. ...
Ch. S1 - Relativity Group
Ch. S1 - Relativity Group

... • Right ascension: Vega’s RA of 18h35.2m (out of 24h) places most of the way around celestial sphere from spring equinox. • Declination: Vega’s dec of +38°44’ puts it almost 39° north of celestial equator (negative dec would be south of equator) ...
Lecture 2 ppt - Physics 1025 Introductory Astronomy
Lecture 2 ppt - Physics 1025 Introductory Astronomy

... • declination (dec) – Analogous to latitude, but on the celestial sphere; it is the angular north-south distance between the celestial equator and a location on the celestial sphere. – Measured in degrees: » 0 ° to 90 ° – north from celestial equator » 0 ° to -90 ° – south from celestial equator ...
Documentazione sull` osservatorio astronomico di Jaipur ( India
Documentazione sull` osservatorio astronomico di Jaipur ( India

... From the earliest period until today the vernal equinox was a reference point for position data. It can be dertermined in a relatively easy way at any place due to the point of sunrise on the eastern horizont and the point of sunset on the western horizont define a line straight through the oberserv ...
Precession of the Equinoxes and its Importance in Calendar Making
Precession of the Equinoxes and its Importance in Calendar Making

... ent path of the Sun in the celestial sphere remains the same, the moon and the planets show some deviations in their motions. The moon and the planets move to some extent towards north and south of the ecliptic. This deviation for the moon does not exceed much more than 5 degrees, while the planets ...
< 1 2 3 4 5 6 7 >

Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit.The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving the positions and velocities of astronomical objects in the sky at a given time or times.Astronomical quantities can be specified in any of several ways, for example, as a polynomial function of the time-interval, with an epoch as a temporal point of origin (this is a common current way of using an epoch). Alternatively, the time-varying astronomical quantity can be expressed as a constant, equal to the measure that it had at the epoch, leaving its variation over time to be specified in some other way—for example, by a table, as was common during the 17th and 18th centuries.The word epoch was often used in a different way in older astronomical literature, e.g. during the 18th century, in connection with astronomical tables. At that time, it was customary to denote as ""epochs"", not the standard date and time of origin for time-varying astronomical quantities, but rather the values at that date and time of those time-varying quantities themselves. In accordance with that alternative historical usage, an expression such as 'correcting the epochs' would refer to the adjustment, usually by a small amount, of the values of the tabulated astronomical quantities applicable to a fixed standard date and time of reference (and not, as might be expected from current usage, to a change from one date and time of reference to a different date and time).
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report