Counting Sunspots - Lunar and Planetary Institute
... the cycle has been relatively uniform this century, there have been large variations in the past. From about 1645 to 1715, a period known as the Maunder minimum, apparently few sunspots were present on the Sun. Also during that period, the Earth was much cooler than it http://www.makeitsolar.com/puz ...
... the cycle has been relatively uniform this century, there have been large variations in the past. From about 1645 to 1715, a period known as the Maunder minimum, apparently few sunspots were present on the Sun. Also during that period, the Earth was much cooler than it http://www.makeitsolar.com/puz ...
General NG Celestial Questions
... Ref: Celestial, Definition, Instrument, Azimuth Circle The accuracy of an azimuth circle can be checked by __________. A. sighting a terrestrial range in line and comparing the observed bearing against the charted bearing B. aligning the relative bearing markings so that 000° is on the lubber's line ...
... Ref: Celestial, Definition, Instrument, Azimuth Circle The accuracy of an azimuth circle can be checked by __________. A. sighting a terrestrial range in line and comparing the observed bearing against the charted bearing B. aligning the relative bearing markings so that 000° is on the lubber's line ...
SOHO`s Frequently Asked Questions
... "activity cycle." We have known about the cycle since the 19th century, because it was seen in sunspot records. The Sun spends a few years at the peak of its cycle. This is known as "solar maximum." The few years during the less-active part of the cycle are called "solar minimum," or "quiet sun." Bi ...
... "activity cycle." We have known about the cycle since the 19th century, because it was seen in sunspot records. The Sun spends a few years at the peak of its cycle. This is known as "solar maximum." The few years during the less-active part of the cycle are called "solar minimum," or "quiet sun." Bi ...
2012 December Vol. 49 No 584
... RA 22h 23m 08.26s DEC -28° 56' 52.4” (2000), about 36.2”E and 25.1”N of NGC 7259. However rather than a conventional supernova, later reports discussed a subsequent series of LBV eruptions in the object. On ATEL 4334 A. J. Drake reported the discovery of a new bright outburst from spectroscopically ...
... RA 22h 23m 08.26s DEC -28° 56' 52.4” (2000), about 36.2”E and 25.1”N of NGC 7259. However rather than a conventional supernova, later reports discussed a subsequent series of LBV eruptions in the object. On ATEL 4334 A. J. Drake reported the discovery of a new bright outburst from spectroscopically ...
the PDF - Montana State University
... The Sun is the best observed object in astrophysics, but despite this distinction the nature of its well-ordered generation of magnetic field in 11-year activity cycles remains a mystery. In this work, we place the solar cycle in a broader context by examining the long-term variability of solar anal ...
... The Sun is the best observed object in astrophysics, but despite this distinction the nature of its well-ordered generation of magnetic field in 11-year activity cycles remains a mystery. In this work, we place the solar cycle in a broader context by examining the long-term variability of solar anal ...
Global Seismology of the Sun
... stellar models in Section 2. We then proceed to derive the equations of stellar oscillation and describe some the properties of the oscillations in Section 3. A brief history of solar models is given in Section 4. We show what happens when we try to compare solar models with the Sun by comparing fre ...
... stellar models in Section 2. We then proceed to derive the equations of stellar oscillation and describe some the properties of the oscillations in Section 3. A brief history of solar models is given in Section 4. We show what happens when we try to compare solar models with the Sun by comparing fre ...
www.mve.com Thermal Subsidence Tool in Move
... Before using the Thermal Subsidence tool, it is important to assign an age to each horizon in the Stratigraphy database. The database lists all horizons in the model along with their assigned colour, age, thickness and rock type. Any changes made to a horizon within the Stratigraphy database (i.e. c ...
... Before using the Thermal Subsidence tool, it is important to assign an age to each horizon in the Stratigraphy database. The database lists all horizons in the model along with their assigned colour, age, thickness and rock type. Any changes made to a horizon within the Stratigraphy database (i.e. c ...
Me and My Shadow - Making the Sun-Earth - PS
... latitude), the gnomon shadow falls on the upper dial face; from the September Equinox to the March Equinox, when the subsolar point is located in the Southern Hemisphere (between 0° and 23.5°S latitude), the gnomon shadow falls on the lower dial face (see example). Put a little theory into practice- ...
... latitude), the gnomon shadow falls on the upper dial face; from the September Equinox to the March Equinox, when the subsolar point is located in the Southern Hemisphere (between 0° and 23.5°S latitude), the gnomon shadow falls on the lower dial face (see example). Put a little theory into practice- ...
Properties of White Dwarfs, Teacher Guide
... Some background: Sirius is a nearby star – only 9 light-years away. All stars in our Galaxy orbit the Galactic barycenter, so they are all moving. Astronomers detect and track the motion of stars relative to our Sun. There are two motions that can be measured: radial velocity (in the line of sight) ...
... Some background: Sirius is a nearby star – only 9 light-years away. All stars in our Galaxy orbit the Galactic barycenter, so they are all moving. Astronomers detect and track the motion of stars relative to our Sun. There are two motions that can be measured: radial velocity (in the line of sight) ...
the strange case of claudius ptolemy
... Ptolemy in such a matter and I think it is quite possible that Hipparchus did contribute to planetary theory. Before turning to Ptolemy's work, we should note briefly the state of mathematics in his time. Many readers are acquainted with Euclid, who was a contemporary of Aristarchus and whose work o ...
... Ptolemy in such a matter and I think it is quite possible that Hipparchus did contribute to planetary theory. Before turning to Ptolemy's work, we should note briefly the state of mathematics in his time. Many readers are acquainted with Euclid, who was a contemporary of Aristarchus and whose work o ...
NAVIGATION SCHOOL AND COLLEGE
... not quite a true sphere. The scientists whose work it is to study the exact shape of the earth and whose branch of science is known as geophysics, continue to make fresh discoveries from time to time, but their general conclusions appear to be that the earth is an "oblate spheroid". This means that ...
... not quite a true sphere. The scientists whose work it is to study the exact shape of the earth and whose branch of science is known as geophysics, continue to make fresh discoveries from time to time, but their general conclusions appear to be that the earth is an "oblate spheroid". This means that ...
swisseph - Astrodienst
... The Babylonian tradition and the Fagan/Bradley ayanamsha ....................................................................... 28 The Hipparchan tradition .............................................................................................................................. 29 Suryasiddhant ...
... The Babylonian tradition and the Fagan/Bradley ayanamsha ....................................................................... 28 The Hipparchan tradition .............................................................................................................................. 29 Suryasiddhant ...
PDF File
... is present for the silicon abundances, as can be seen from Fig. 4. For this reason, no correction is necessary and a value of ∆ log C6 = 0 was adopted for this abundance determination. This agrees with Holweger (1973) and, moreover, confirms the upper limit of ∆ log C6 ≈ 0.3 given in that work. For ...
... is present for the silicon abundances, as can be seen from Fig. 4. For this reason, no correction is necessary and a value of ∆ log C6 = 0 was adopted for this abundance determination. This agrees with Holweger (1973) and, moreover, confirms the upper limit of ∆ log C6 ≈ 0.3 given in that work. For ...
Resonance locking as the source of rapid tidal migration in the
... by its internal properties and should not preferentially create an orbital migration time scale comparable to the age of the solar system. In classical tidal theory, tidal energy dissipation occurs via the frictional damping of the equilibrium tide, which is defined as the tidal distortion that woul ...
... by its internal properties and should not preferentially create an orbital migration time scale comparable to the age of the solar system. In classical tidal theory, tidal energy dissipation occurs via the frictional damping of the equilibrium tide, which is defined as the tidal distortion that woul ...
Aalborg Universitet Spacecraft Attitude Determination with Earth Albedo Corrected Sun Sensor Measurements
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
Geometric Reference Systems in Geodesy
... Astronomy, taught for many years at Ohio State University to students pursuing the Master of Science degree in Geodesy. Over the last decade parts of these two courses have become irrelevant, anachronistic, and in need of revision. The new course, now called Geometric Reference Systems, combines the ...
... Astronomy, taught for many years at Ohio State University to students pursuing the Master of Science degree in Geodesy. Over the last decade parts of these two courses have become irrelevant, anachronistic, and in need of revision. The new course, now called Geometric Reference Systems, combines the ...
Meridian Passage - Shipofficer.com
... In the figure, the meridian is intentionally kept at 15´ intervals, e.g., 123°, 123°15´, 123°30´, etc., because the sun is apparently moving westward at 15´ of longitude in 1 minute of time. The time of meridian passage on the top of the plot can then be marked at 1 minute intervals for every corres ...
... In the figure, the meridian is intentionally kept at 15´ intervals, e.g., 123°, 123°15´, 123°30´, etc., because the sun is apparently moving westward at 15´ of longitude in 1 minute of time. The time of meridian passage on the top of the plot can then be marked at 1 minute intervals for every corres ...
orbital resonances and chaos in the solar system
... young child is delighted in a playground swing when an older companion drives the swing at its natural frequency and rapidly increases the swing amplitude; the older child accomplishes the same on her own without outside assistance by driving the swing at a frequency twice that of its natural freque ...
... young child is delighted in a playground swing when an older companion drives the swing at its natural frequency and rapidly increases the swing amplitude; the older child accomplishes the same on her own without outside assistance by driving the swing at a frequency twice that of its natural freque ...
PPT
... fi = 1 (fraction of those that evolve into intelligent beings) fc = 1 (fraction of those that develop the right technology to send ...
... fi = 1 (fraction of those that evolve into intelligent beings) fc = 1 (fraction of those that develop the right technology to send ...
- Spiral - Imperial College London
... the solar values. Thus, even if the solar activity cycle is anomalous with respect to the majority of stars (as was for example proposed by Böhm-Vitense 2007) there are stars which exhibit solar-like chromospheric and photometric variabilities. We note that the comparison of stellar and solar varia ...
... the solar values. Thus, even if the solar activity cycle is anomalous with respect to the majority of stars (as was for example proposed by Böhm-Vitense 2007) there are stars which exhibit solar-like chromospheric and photometric variabilities. We note that the comparison of stellar and solar varia ...
(a) Mean solar time
... NZST in Christchurch (172½E of Greenwich), so local MST is ~30 m behind NZST (in ChCh) (mean Sun is due north at 12h 30m NZST in ...
... NZST in Christchurch (172½E of Greenwich), so local MST is ~30 m behind NZST (in ChCh) (mean Sun is due north at 12h 30m NZST in ...
Regular and Chaotic Dynamics in the Mean
... It does not depend on Sz, σz because of the coplanarity, and does not depend on ν because 5 in equation (2) is invariant by rotation around an axis perpendicular to the orbital plane. Consequently, ...
... It does not depend on Sz, σz because of the coplanarity, and does not depend on ν because 5 in equation (2) is invariant by rotation around an axis perpendicular to the orbital plane. Consequently, ...
The Sun
... • Random movements in the sun caused by convection or eruptions constantly produce vibrations. – Some of those vibrations resonate like sound waves in organ pipes. – These vibrations are just sound waves of very long period. – The periods range from about 3 to 20 minutes. – A vibration with a period ...
... • Random movements in the sun caused by convection or eruptions constantly produce vibrations. – Some of those vibrations resonate like sound waves in organ pipes. – These vibrations are just sound waves of very long period. – The periods range from about 3 to 20 minutes. – A vibration with a period ...
Elements of astronomy
... any other night. They all seem to be at the same distance from us, and to be attached to the surface of a vast hemisphere, of which the place of the observer is the centre. But, although the stars are relatively fixed, the hemisphere, Stars rise obliquely from as a whole, is in constant motion. the ...
... any other night. They all seem to be at the same distance from us, and to be attached to the surface of a vast hemisphere, of which the place of the observer is the centre. But, although the stars are relatively fixed, the hemisphere, Stars rise obliquely from as a whole, is in constant motion. the ...
Stellar Structure and Evolution
... and to Karlheinz Langanke for translating it from the Danish original (‘Stjerneudviklingens slutstadier’). I also thank Langanke for very substantial contributions to the revised Chapters 14 and 15. Discussions with A. V. Sweigart and J. Lattanzio were very helpful in bringing my ideas about late st ...
... and to Karlheinz Langanke for translating it from the Danish original (‘Stjerneudviklingens slutstadier’). I also thank Langanke for very substantial contributions to the revised Chapters 14 and 15. Discussions with A. V. Sweigart and J. Lattanzio were very helpful in bringing my ideas about late st ...
Equation of time
The equation of time describes the discrepancy between two kinds of solar time. These are apparent solar time, which directly tracks the motion of the sun, and mean solar time, which tracks a fictitious ""mean"" sun with noons 24 hours apart. Apparent (or true) solar time can be obtained by measurement of the current position (hour angle) of the Sun, or indicated (with limited accuracy) by a sundial. Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time average to zero.The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the year, compiled by astronomical observatories, were widely listed in almanacs and ephemerides.