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- N✓N✓N✓NA✓A✓A✓AM✓M✓M✓ME✓E✓E✓E
- stardsp, starpic, startek - print astronomical star charts
- using Yale database
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- S✓S✓S✓SY✓Y✓Y✓YN✓N✓N✓NO✓O✓O✓OP✓P✓P✓PS✓S✓S✓SI✓I✓I✓IS✓S✓S✓S
- These programs generate star charts based on data extracted
- from the Yale public domain star catalog. Output is to the
- terminal (s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓rd✓d✓d✓ds✓s✓s✓sp✓p✓p✓p), Unix PIC file (s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓rp✓p✓p✓pi✓i✓i✓ic✓c✓c✓c) or in Tektronix
- vector format (s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓rt✓t✓t✓te✓e✓e✓ek✓k✓k✓k). Star data is optionally overlayed
- with other cosmic objects, such as planets.
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- E✓E✓E✓EX✓X✓X✓XA✓A✓A✓AM✓M✓M✓MP✓P✓P✓PL✓L✓L✓LE✓E✓E✓ES✓S✓S✓S
- # Orion: the belt lies near 5h40m in RA, just below the CE.
- stardsp 5.6 -4.1 11.2 "Orion & belt" | more
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- D✓D✓D✓DE✓E✓E✓ES✓S✓S✓SC✓C✓C✓CR✓R✓R✓RI✓I✓I✓IP✓P✓P✓PT✓T✓T✓TI✓I✓I✓IO✓O✓O✓ON✓N✓N✓N
- The starchart center is specified by two parameters: floats
- defining Right Ascension [0.0 to 24.0 hours] and Declination
- [-90.0 to +90.0 degrees]. An optional third parameter
- defines the N/S range of the output window, in degrees of
- declination. An optional fourth parameter gives a title.
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- The software reads data from a local file (y✓y✓y✓ya✓a✓a✓al✓l✓l✓le✓e✓e✓e.✓.✓.✓.s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓r) and
- optional planetary file (p✓p✓p✓pl✓l✓l✓la✓a✓a✓an✓n✓n✓ne✓e✓e✓et✓t✓t✓t.✓.✓.✓.s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓r) and clips to a
- rectangular (in RA and DEC) window. Objects within this
- window are projected onto the output media, and displayed
- using the appropriate glyphs. Present implementations draw
- two viewports: a "master" chart plus a "thumbnail" overview
- with low limiting magnitude. Their location and the
- limiting magnitude is specified by records in the device
- driver, allowing the chart layout be tuned on a per-device
- basis. The output is annotated with viewport boundaries, a
- legend and axis labels.
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- Sanson's sinusoidal projection is used to map coordinates.
- This projection preserves both area and linearity in
- Declination (y axis). It gives good conformality (angle
- correctness) near the equator, so it is useful along the
- Ecliptic. Lines of RA converge at the poles (unlike
- cylindrical projections), though Cassiopeia and the Dipper
- reproduce well.
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- B✓B✓B✓BU✓U✓U✓UG✓G✓G✓GS✓S✓S✓S
- No testing for bogus ranges and scales which may wrap the
- poles. The present implementation expects y✓y✓y✓ya✓a✓a✓al✓l✓l✓le✓e✓e✓e.✓.✓.✓.s✓s✓s✓st✓t✓t✓ta✓a✓a✓ar✓r✓r✓r sorted
- by decreasing magnitude so that output is sequential, and
- then cuts off below a limiting magnitude. For more detailed
- charts spatial sorting is more appropriate.
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- A✓A✓A✓AU✓U✓U✓UT✓T✓T✓TH✓H✓H✓HO✓O✓O✓OR✓R✓R✓R
- Alan Paeth, University of Waterloo (AWPaeth@watCGL)
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- Page 1 (printed 2/7/87)
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