diff --git a/README.md b/README.md index 82141ddc..8ca93e49 100644 --- a/README.md +++ b/README.md @@ -75,7 +75,7 @@ to change existing (functional) code you may have written for NOVAS C. SuperNOVAS is currently based on NOVAS C version 3.1. We plan to rebase SuperNOVAS to the latest upstream release of the NOVAS C library, if new releases become available. -SuperNOVAS is maintained by [Attila Kovacs](https://github.com/attipaci) at the Center for Astrophysics \| Harvard +SuperNOVAS is maintained by [Attila Kovács](https://github.com/attipaci) at the Center for Astrophysics \| Harvard & Smithsonian, and it is available through the [Smithsonian/SuperNOVAS](https://github.com/Smithsonian/SuperNOVAS) repository on GitHub. @@ -369,6 +369,11 @@ switch between different planet and ephemeris calculator functions at will, duri - [Calculating positions for a Solar-system source](#solsys-example) +SuperNOVAS __v1.1__ has introduced a new, more intuitive, more elegant, and more efficient approach for calculating +astrometric positions of celestial objects. The guide below is geared towards this new method. However, the original +NOVAS C approach remains viable also (albeit often less efficient). You may find an equivalent example usage +showcasing the original NOVAS method in [LEGACY.md](LEGACY.html). + ### Note on alternative methodologies @@ -393,18 +398,17 @@ See the various enums and constants defined in `novas.h`, as well as the descrip on how they are appropriate for the old and new methodologies respectively. Figure 1 also shows the relation of the various old and new coordinate systems and the (Super)NOVAS functions for converting among them. -In NOVAS, the barycentric BCRS and the geocentric GCRS systems are effectively synonymous to ICRS. The origin for -positions and for velocities, in any reference system, is determined by the `observer` location. +In NOVAS, the barycentric BCRS and the geocentric GCRS systems are effectively synonymous to ICRS, since the origin +for positions and for velocities, in any reference system, is determined by the `observer` location. + +TIRS (Intermediate Terrestrial Reference System) is not explicitly referenced in SuperNOVAS. But it can be thought +of as a special case of ITRS (International Terrestrial Reference System) with DUT1 (= UT1-UTC), the polar offsets +(_dx_, _dy_) all set to zero. | ![SuperNOVAS coordinate systems and conversions](resources/SuperNOVAS-systems.png) | |:--:| | __Figure 1.__ *SuperNOVAS Coordinate Systems and Conversions*. Functions indicated in bold face are available in NOVAS C also. All other functions are available in SuperNOVAS only. | -SuperNOVAS __v1.1__ has introduced a new, more intuitive, more elegant, and more efficient approach for calculating -astrometric positions of celestial objects. The guide below is geared towards this new method. However, the original -NOVAS C approach remains viable also (albeit often less efficient). You may find an equivalent example usage -showcasing the original NOVAS method in [LEGACY.md](LEGACY.html). - ### Calculating positions for a sidereal source diff --git a/resources/SuperNOVAS-systems.dia b/resources/SuperNOVAS-systems.dia index fe30640f..9446fd87 100644 Binary files a/resources/SuperNOVAS-systems.dia and b/resources/SuperNOVAS-systems.dia differ diff --git a/resources/SuperNOVAS-systems.png b/resources/SuperNOVAS-systems.png index c559d825..e7214d56 100644 Binary files a/resources/SuperNOVAS-systems.png and b/resources/SuperNOVAS-systems.png differ