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Mr. Weidon Lamb
1855 Evans Place
Las Cruces, New Mexico 88001
Dear Mr. Lamb:
The topics of subject matter listed in your letter Is so scattered 1n various
books and journals that you would need to look through the bookshelves of astronomy through books 1n the University Library. It would be quite a task.
You would need to study a three hour course 1n Spherical Astronomy and make
liberal use of spherical trigonometry.
However, for approximate positions, you could do some of 1t graphically. See
January 1973 Issue of Sky & Telescope for star charts, and the Maryland Academy
of Sciences graphic time chart 1n that Issue.
You may purchase a few copies only of "Constellation Star Charts SCI & SC2" 1n
the University Book Store for 104 each (not many could be spared because 1t may
run the stock supply short, which has been carefully estimated for the Fall Semester classes.) The Right Ascensions and Declinations of the stars change with
the Precession of Equinoxes. The Vernal Equinox slides westward 50 seconds of
arc per year, so that it would traverse the path of the Ecliptic in 25,800 years.
For example the Summer Solstice position was near Regulus of Leo 1n the early
portion of the Roman Empire. Changes 1n Declination affects the elevation angle
of stars above the horizon for a given latitude.
Conversion tables for converting equatorial coordinates to alt-az1muth coordinates, or vice versa, which 1s essentially the process of celestial navigation,
are given 1n H.0. (Hydrographic Office) 214 1n nine volumes. Vol. 4 1s for latitude 30 thoough 39 degrees latitude. Eor latitudes 13 to 17° North would be found
1n Bol. 2.
Also* see "Tables of Sunrise and Sunset, and Twilight" published by U. S. Naval
Obs. (which should also be in the University Library) which gives the times for
every day of the year for each degree 1n latitude. Also, see the "American
Ephemerls and Nautical Almanac" a volume of data for each year.
Sincerely,
Clyde W. Tombaugh
Professor of Astronomy Emeritus
Object Description
| Title | Correspondents (L), 1971-1987 |
| Series | NMSU Astronomy Department, Box 090, Folder 004 |
| Creator | Tombaugh, Clyde William, 1906-1997; Lambert, John V.; Lance, Walt;Lü, Phillip K.; Lancaster, John H. |
| Subject | Astronomy; Books; Amateur astronomy; Stars; Autumnal equinox; Vernal equinox; Report writing; Satellites; Satellites--Research; Space debris; Telephone calls; Meteorites; New Mexico State University; Thank-you notes; Pluto (Dwarf planet); Anniversaries; Congresses and conventions; Academic writing; Charon (Satellite); Methane; Volunteers; Observatories; Astronomy--Study and teaching; Students; Apologies; New Mexico State University. Astronomy Department; Technical reports; Mars (Planet); Project Mariner (U.S.); Very large array telescopes--New Mexico; Invitation cards; Dedications; Stars; Lowell Observatory; Errata |
| Relevant Names | Sky and telescope; Sproul Observatory; Western Connecticut State College; Jet Propulsion Laboratory (U.S.); National Radio Astronomy Observatory (U.S.); |
| Digital Publisher | New Mexico State University Library |
| Collection | NMSU Department of Astronomy: Clyde W. Tombaugh Papers |
| Source | Scan produced from physical item held by the NMSU Library Archives & Special Collections Department |
| Type | Text |
| Format | image/tiff |
| Language | eng |
Page Description
| Title | Page 1 |
| Series | NMSU Astronomy Department, Box 090, Folder 004 |
| Creator | Tombaugh, Clyde William, 1906-1997 |
| Subject | Astronomy; Books; Amateur astronomy; Stars; Autumnal equinox; Vernal equinox |
| Relevant Names | Sky and telescope |
| Date Original | 1973-06-08 |
| Digital Publisher | New Mexico State University Library |
| Collection | NMSU Department of Astronomy: Clyde W. Tombaugh Papers |
| Digital Identifier | Ms0407pp090004_0010001.tif |
| Source | Scan produced from physical item held by the NMSU Library Archives & Special Collections Department |
| Type | Text |
| Format | image/tiff |
| Language | eng |
| OCR | Mr. Weidon Lamb 1855 Evans Place Las Cruces, New Mexico 88001 Dear Mr. Lamb: The topics of subject matter listed in your letter Is so scattered 1n various books and journals that you would need to look through the bookshelves of astronomy through books 1n the University Library. It would be quite a task. You would need to study a three hour course 1n Spherical Astronomy and make liberal use of spherical trigonometry. However, for approximate positions, you could do some of 1t graphically. See January 1973 Issue of Sky & Telescope for star charts, and the Maryland Academy of Sciences graphic time chart 1n that Issue. You may purchase a few copies only of "Constellation Star Charts SCI & SC2" 1n the University Book Store for 104 each (not many could be spared because 1t may run the stock supply short, which has been carefully estimated for the Fall Semester classes.) The Right Ascensions and Declinations of the stars change with the Precession of Equinoxes. The Vernal Equinox slides westward 50 seconds of arc per year, so that it would traverse the path of the Ecliptic in 25,800 years. For example the Summer Solstice position was near Regulus of Leo 1n the early portion of the Roman Empire. Changes 1n Declination affects the elevation angle of stars above the horizon for a given latitude. Conversion tables for converting equatorial coordinates to alt-az1muth coordinates, or vice versa, which 1s essentially the process of celestial navigation, are given 1n H.0. (Hydrographic Office) 214 1n nine volumes. Vol. 4 1s for latitude 30 thoough 39 degrees latitude. Eor latitudes 13 to 17° North would be found 1n Bol. 2. Also* see "Tables of Sunrise and Sunset, and Twilight" published by U. S. Naval Obs. (which should also be in the University Library) which gives the times for every day of the year for each degree 1n latitude. Also, see the "American Ephemerls and Nautical Almanac" a volume of data for each year. Sincerely, Clyde W. Tombaugh Professor of Astronomy Emeritus |
