# Solar time

Solar time is a calculation of the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day, based on the synodic rotation period. Traditionally, there are three types of time reckoning based on astronomical observations: apparent solar time and mean solar time (discussed in this article), and sidereal time, which is based on the apparent motions of stars other than the Sun.[1]

## Introduction

A tall pole vertically fixed in the ground casts a shadow on any sunny day. At one moment during the day, the shadow will point exactly north or south (or disappear when and if the Sun moves directly overhead). That instant is local apparent noon, or 12:00 local apparent time. About 24 hours later the shadow will again point north–south, the Sun seeming to have covered a 360-degree arc around Earth's axis. When the Sun has covered exactly 15 degrees (1/24 of a circle, both angles being measured in a plane perpendicular to Earth's axis), local apparent time is 13:00 exactly; after 15 more degrees it will be 14:00 exactly.

The problem is that in September the Sun takes less time (as measured by an accurate clock) to make an apparent revolution than it does in December; 24 "hours" of solar time can be 21 seconds less or 29 seconds more than 24 hours of clock time. This change is quantified by the equation of time, and is due to the eccentricity of Earth's orbit (as in, Earth's orbit is not perfectly circular, meaning that the Earth–Sun distance varies throughout the year), and the fact that Earth's axis is not perpendicular to the plane of its orbit (the so-called obliquity of the ecliptic).

The effect of this is that a clock running at a constant rate – e.g. completing the same number of pendulum swings in each hour – cannot follow the actual Sun; instead it follows an imaginary "mean Sun" that moves along the celestial equator at a constant rate that matches the real Sun's average rate over the year.[2] This is "mean solar time", which is still not perfectly constant from one century to the next but is close enough for most purposes. As of 2008, a mean solar day is about 86,400.002 SI seconds, i.e., about 24.0000006 hours.[3]

## Apparent solar time

The apparent sun is the true sun as seen by an observer on Earth.[4] Apparent solar time or true solar time[a] is based on the apparent motion of the actual Sun. It is based on the apparent solar day, the interval between two successive returns of the Sun to the local meridian.[5][6] Apparent solar time can be crudely measured by a sundial. The equivalent on Mars is termed Mars local true solar time (LTST).[7][8]

The length of a solar day varies through the year, and the accumulated effect produces seasonal deviations of up to 16 minutes from the mean. The effect has two main causes. First, due to the eccentricity of Earth's orbit, Earth moves faster when it is nearest the Sun (perihelion) and slower when it is farthest from the Sun (aphelion) (see Kepler's laws of planetary motion). Second, due to Earth's axial tilt (known as the obliquity of the ecliptic), the Sun's annual motion is along a great circle (the ecliptic) that is tilted to Earth's celestial equator. When the Sun crosses the equator at both equinoxes, the Sun's daily shift (relative to the background stars) is at an angle to the equator, so the projection of this shift onto the equator is less than its average for the year; when the Sun is farthest from the equator at both solstices, the Sun's shift in position from one day to the next is parallel to the equator, so the projection onto the equator of this shift is larger than the average for the year (see tropical year). In June and December when the sun is farthest from the celestial equator, a given shift along the ecliptic corresponds to a large shift at the equator. Therefore, apparent solar days are shorter in March and September than in June or December.

Length of apparent solar day (1998)[9]
Date Duration in mean solar time
February 11 24 hours
March 26 24 hours − 18.1 seconds
May 14 24 hours
June 19 24 hours + 13.1 seconds
July 25/26 24 hours
September 16 24 hours − 21.3 seconds
November 2/3 24 hours
December 22 24 hours + 29.9 seconds

These lengths will change slightly in a few years and significantly in thousands of years.

## Mean solar time

Mean solar time is the hour angle of the mean Sun plus 12 hours. This 12 hour offset comes from the decision to make each day start at midnight for civil purposes, whereas the hour angle or the mean sun is measured from the local meridian.[10] As of 2009, this is realized with the UT1 time scale, constructed mathematically from very-long-baseline interferometry observations of the diurnal motions of radio sources located in other galaxies, and other observations.[11]: 68, 326 [12] The duration of daylight varies during the year but the length of a mean solar day is nearly constant, unlike that of an apparent solar day.[13] An apparent solar day can be 20 seconds shorter or 30 seconds longer than a mean solar day.[9][14] Long or short days occur in succession, so the difference builds up until mean time is ahead of apparent time by about 14 minutes near February 6, and behind apparent time by about 16 minutes near November 3. The equation of time is this difference, which is cyclical and does not accumulate from year to year.

Mean time follows the mean sun. Jean Meeus describes the mean sun as follows:

Consider a first fictitious Sun travelling along the ecliptic with a constant speed and coinciding with the true sun at the perigee and apogee (when the Earth is in perihelion and aphelion, respectively). Then consider a second fictitious Sun travelling along the celestial equator at a constant speed and coinciding with the first fictitious Sun at the equinoxes. This second fictitious sun is the mean Sun[15]

The length of the mean solar day is slowly increasing due to the tidal acceleration of the Moon by Earth and the corresponding slowing of Earth's rotation by the Moon.

## History

The sun has always been visible in the sky, and its position forms the basis of apparent solar time, the timekeeping method used in antiquity. An Egyptian obelisk constructed c. 3500 BC,[16] a gnomon in China dated 2300 BC,[17] and an Egyptian sundial dated 1500 BC[18] are some of the earliest methods for measuring the sun's position.

Babylonian astronomers knew that the hours of daylight varied throughout the year. A tablet from 649 BC shows that they used a 2:1 ratio for the longest day to the shortest day, and estimated the variation using a linear zigzag function.[19] It is not clear if they knew of the variation in the length of the solar day and the corresponding equation of time. Ptolemy clearly distinguishes the mean solar day and apparent solar day in his Almagest (2nd century), and he tabulated the equation of time in his Handy Tables.[20]

Apparent solar time grew less useful as commerce increased and mechanical clocks improved. Mean solar time was introduced in almanacs in England in 1834 and in France in 1835. Because the sun was difficult to observe directly due to its large size in the sky, mean solar time was determined as a fixed ratio of time as observed by the stars, which used point-like observations. A specific standard for measuring "mean solar time" from midnight came to be called Universal Time.[11]: 9–11

Conceptually Universal Time is the rotation of the Earth with respect to the sun and hence is mean solar time. However, UT1, the version in common use since 1955, uses a slightly different definition of rotation that corrects for the motion of Earth's poles as it rotates. The difference between this corrected mean solar time and Coordinated Universal Time (UTC) determines whether a leap second is needed. (Since 1972 the UTC time scale has run on SI seconds, and the SI second, when adopted, was already a little shorter than the current value of the second of mean solar time.[21][11]: 227–231 )

## Notes

1. ^ 'apparent' is commonly used in English-language sources, but 'true' is used in French astronomical literature and has become nearly as common in English sources. See:
• Vince, Samuel (1797). A Complete System Of Astronomy Vol 1. Cambridge University Press. p. 44. What we call apparent time the French call true
• "Comprendre - Concepts fondamentaux - Echelles de temps". Bureau des Longitudes (in French). November 23, 2009. Archived from the original on November 23, 2009. temps vrai [true time]
• Allison, Michael; Schmunk, Robert (June 30, 2015). "Technical Notes on Mars Solar Time as Adopted by the Mars24 Sunclock". Goddard Institute for Space Studies. National Aeronautics and Space Administration. Archived from the original on September 25, 2015. Retrieved October 8, 2015. the solar hour angle or True Solar Time (TST)

## References

1. ^ For the three kinds of time, see (for example) the explanatory section in the almanac Connaissance des Temps for 1902, page 759 Archived August 10, 2011, at the Wayback Machine.
2. ^ "solar time, mean". Glossary, Astronomical Almanac Online. Her Majesty's Nautical Almanac Office and the United States Naval Observatory. 2021.
3. ^ "Leap Seconds". Time Service Department, United States Naval Observatory. 1999. Archived from the original on March 12, 2015.
4. ^ Tatum, J.B. (March 27, 2022). "Celestial Mechanics Chapter 6" (PDF). University of Victoria. Archived (PDF) from the original on September 23, 2015.
5. ^ "solar time, apparent". Glossary, Astronomical Almanac Online. Her Majesty's Nautical Almanac Office and the United States Naval Observatory. 2021.
6. ^ Yallop, B. D.; Hohenker, C. Y. (August 1989). "Astronomical Information Sheet No. 58" (PDF). HM Nautical Almanac Office. Solar Location Diagram.
7. ^ Allison, Michael; Schmunk, Robert (June 30, 2015). "Technical Notes on Mars Solar Time as Adopted by the Mars24 Sunclock". Goddard Institute for Space Studies. National Aeronautics and Space Administration. Archived from the original on September 25, 2015. Retrieved October 8, 2015.
8. ^ Allison, Michael; McEwen, Megan (2000). "A post-Pathfinder evaluation of areocentric solar coordinates with improved timing recipes for Mars seasonal/diurnal climate studies". Planetary and Space Science. 48 (2–3): 215. Bibcode:2000P&SS...48..215A. doi:10.1016/S0032-0633(99)00092-6. hdl:2060/20000097895. S2CID 123014765. Archived from the original on June 23, 2015.
9. ^ a b Jean Meeus (1997), Mathematical astronomy morsels (Richmond, VA: Willmann-Bell) 346. ISBN 0-943396-51-4.
10. ^ Hilton, James L; McCarthy, Dennis D. (2013). "Precession, Nutation, Polar Motion, and Earth Rotation". In Urban, Sean E.; Seidelmann, P. Kenneth (eds.). Explanatory Supplement to the Astronomical Almanac (3rd ed.). Mill Valley, CA: University Science Books. ISBN 978-1-891389-85-6.
11. ^ a b c McCarthy, D. D.; Seidelmann, P. K. (2009). TIME From Earth Rotation to Atomic Physics. Weinheim: Wiley-VCH Verlag GmbH & Co. KGa. ISBN 978-3-527-40780-4.
12. ^ Capitaine, N.; Wallace, P. T.; McCarthy, D. D. (2003). "Expressions to implement the IAU 2000 definition of UT1". Astronomy and Astrophysics. 406 (3): 1135–1149. Bibcode:2003A&A...406.1135C. doi:10.1051/0004-6361:20030817. S2CID 54008769. (or in pdf form); and for some earlier definitions of UT1 see Aoki, S.; Guinot, B.; Kaplan, G. H.; Kinoshita, H.; McCarthy, D. D.; Seidelmann, P. K. (1982). "The new definition of universal time". Astronomy and Astrophysics. 105 (2): 359–361. Bibcode:1982A&A...105..359A.
13. ^ For a discussion of the slight changes that affect the mean solar day, see the ΔT article.
14. ^ Ricci, Pierpaolo. "The duration of the true solar day". pierpaoloricci.it. Archived from the original on August 26, 2009.
15. ^ Meeus, J. (1998). Astronomical Algorithms. 2nd ed. Richmond VA: Willmann-Bell. p. 183.
16. ^ "A Walk Through Time - Early Clocks". A Walk Through Time - The Evolution of Time Measurement through the Ages. National Institute of Standards and Technology. August 12, 2009.
17. ^ Li, Geng (2015). "Gnomons in Ancient China". In Ruggles, C. (ed.). Handbook of Archaeoastronomy and Ethnoastronomy. pp. 2095–2104. Bibcode:2015hae..book.2095L. doi:10.1007/978-1-4614-6141-8_219. ISBN 978-1-4614-6140-1.
18. ^ Vodolazhskaya, L.N. (2014). "Reconstruction of ancient Egyptian sundials" (PDF). Archaeoastronomy and Ancient Technologies. 2 (2): 1–18. arXiv:1408.0987.
19. ^ Pingree, David; Reiner, Erica (1974). "A Neo-Babylonian Report on Seasonal Hours". Archiv für Orientforschung. 25: 50–55. ISSN 0066-6440. JSTOR 41636303.
20. ^ Neugebauer, Otto (1975), A History of Ancient Mathematical Astronomy, New York / Heidelberg / Berlin: Springer-Verlag, pp. 984–986, ISBN 978-0-387-06995-1
21. ^ :(1) In "The Physical Basis of the Leap Second", by D D McCarthy, C Hackman and R A Nelson, in Astronomical Journal, vol.136 (2008), pages 1906-1908, it is stated (page 1908), that "the SI second is equivalent to an older measure of the second of UT1, which was too small to start with and further, as the duration of the UT1 second increases, the discrepancy widens." :(2) In the late 1950s, the cesium standard was used to measure both the current mean length of the second of mean solar time (UT2) (result: 9192631830 cycles) and also the second of ephemeris time (ET) (result:9192631770 ± 20 cycles), see "Time Scales", by L. Essen Archived October 19, 2008, at the Wayback Machine, in Metrologia, vol.4 (1968), pp.161-165, on p.162. As is well known, the 9192631770 figure was chosen for the SI second. L Essen in the same 1968 article (p.162) stated that this "seemed reasonable in view of the variations in UT2".