From 3a20fe1c734ffa39e7496a0679c7317394ec3eda Mon Sep 17 00:00:00 2001 From: BONNAREL FRANCOIS Date: Fri, 17 Mar 2023 17:34:09 +0100 Subject: [PATCH 1/3] addition of details for TIMESYS in the case of calendar years time stamps --- VOTable.tex | 12 ++++++++---- localrefs.bib | 19 +++++++++++++++++++ 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/VOTable.tex b/VOTable.tex index d753dbc..c7812bd 100644 --- a/VOTable.tex +++ b/VOTable.tex @@ -686,12 +686,14 @@ \subsection{\elem{COOSYS} Element} \item[\attr{equinox}] Fixes the equatorial or ecliptic systems (as e.g., \verb|"J2000"| as the default +<<<<<<< HEAD for \verb|"eq_FK5"| or \verb|"B1950"|, as the default for \verb|"eq_FK4"|). \item[\attr{epoch}] Specifies the epoch of the positions if necessary, again as an astroYear (i.e, prefixed with J or B depending -on whether Julian or Besselian years are used). +on whether Julian or Besselian years are used). Both equinox and epoch MUST +expressed in the Julian or Besselian calendar. \item[\attr{refposition}] The reference position for which the positions are given. The values of this attribute should be taken form the IVOA @@ -706,8 +708,6 @@ \subsection{\elem{COOSYS} Element} \textsl{UNKNOWN} % /GENERATED \end{description} - - Note that the \elem{COOSYS} may be deprecated in the future in favor of a more generic way of describing the conventions used to define the positions of the objects studied in the enclosed tables. @@ -734,7 +734,7 @@ \subsection{\elem{TIMESYS} Element} \item[\attr{ID}] This attribute is used to reference \elem{TIMESYS} elements from the elements using the time system. \item[\attr{timeorigin}] This is the time origin of the time coordinate, -given as a Julian Date for the the time scale and reference point +given as a Julian Date for the time scale and reference point defined. It is usually given as a floating point literal; for convenience, the magic strings \verb|MJD-origin| (standing for 2400000.5) and \verb|JD-origin| (standing for 0) are also allowed. @@ -745,6 +745,10 @@ \subsection{\elem{TIMESYS} Element} \attrval{xtype}{timestamp}, or years in the Julian or Besselian calendar when a column has \verb|yr|, \verb|a| or \verb|Ba| as its unit and no time origin is given. +When using calendar epochs written in julian or besselian years, note that +conventionally Julian years are tied to the TDB timescale and Besselian years to +the ET timescale \citep{2015A&A...574A..36R}. + \item[\attr{timescale}] This is the time scale used. Values SHOULD be taken from the IVOA \emph{timescale} vocabulary diff --git a/localrefs.bib b/localrefs.bib index f359aeb..8483e62 100644 --- a/localrefs.bib +++ b/localrefs.bib @@ -29,3 +29,22 @@ @Misc{timesys month = {dec}, url = {http://www.ivoa.net/documents/Notes/TimeSys/} } +@ARTICLE{2015A&A...574A..36R, + author = {{Rots}, Arnold H. and {Bunclark}, Peter S. and {Calabretta}, Mark R. and {Allen}, Steven L. and {Manchester}, Richard N. and {Thompson}, William T.}, + title = "{Representations of time coordinates in FITS. Time and relative dimension in space}", + journal = {\aap}, + keywords = {time, standards, methods: data analysis, techniques: miscellaneous, astronomical databases: miscellaneous, reference systems, Astrophysics - Instrumentation and Methods for Astrophysics}, + year = 2015, + month = feb, + volume = {574}, + eid = {A36}, + pages = {A36}, + doi = {10.1051/0004-6361/201424653}, +archivePrefix = {arXiv}, + eprint = {1409.7583}, + primaryClass = {astro-ph.IM}, + adsurl = {https://ui.adsabs.harvard.edu/abs/2015A&A...574A..36R}, + adsnote = {Provided by the SAO/NASA Astrophysics Data System} +} + + From 763c0824d5a8e5453e0c199ab2bc2c53b9b04807 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Fran=C3=A7ois=20Bonnarel?= <52417996+Bonnarel@users.noreply.github.com> Date: Wed, 22 Mar 2023 17:13:36 +0100 Subject: [PATCH 2/3] Update VOTable.tex changing text in the PR --- VOTable.tex | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/VOTable.tex b/VOTable.tex index c7812bd..537b259 100644 --- a/VOTable.tex +++ b/VOTable.tex @@ -686,14 +686,13 @@ \subsection{\elem{COOSYS} Element} \item[\attr{equinox}] Fixes the equatorial or ecliptic systems (as e.g., \verb|"J2000"| as the default -<<<<<<< HEAD for \verb|"eq_FK5"| or \verb|"B1950"|, as the default for \verb|"eq_FK4"|). \item[\attr{epoch}] Specifies the epoch of the positions if necessary, again as an astroYear (i.e, prefixed with J or B depending -on whether Julian or Besselian years are used). Both equinox and epoch MUST -expressed in the Julian or Besselian calendar. +on whether Julian or Besselian years are used). COOSYS only supports time +specifications in Julian or Besselian years. \item[\attr{refposition}] The reference position for which the positions are given. The values of this attribute should be taken form the IVOA From 3f44710895e4492d61b93c8a4c2495a0712b2bcc Mon Sep 17 00:00:00 2001 From: Tom Donaldson Date: Fri, 1 Sep 2023 12:05:37 -0400 Subject: [PATCH 3/3] Workaround unknown macro \aap --- VOTable.tex | 2 ++ 1 file changed, 2 insertions(+) diff --git a/VOTable.tex b/VOTable.tex index 537b259..c0459d3 100644 --- a/VOTable.tex +++ b/VOTable.tex @@ -3,6 +3,8 @@ \usepackage{verbatim} +\newcommand{\aap}{Astronomy and Astrophysics} + \let\A=\href \def\Aref#1{section~\ref{#1}} \def\Arefs#1{section~\ref{#1}}