File:Leapsecond.ut1-utc.svg

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Leapsecond.ut1-utc.svg‎ (SVG file, nominally 600 × 480 pixels, file size: 132 KB)

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Description	Leapsecond.ut1-utc.svg English: Plot showing the difference UT1−UTC in seconds. Vertical segments correspond to leap seconds. Red part of graph was prediction (future values) at the time the file was made. Česky: Graf zobrazující rozdíl UT1−UTC v sekundách. Svislé úseky odpovídají přestupným sekundám. Červená část je předpověď budoucích hodnot (v okamžiku vytvoření grafu).
Date	8 April 2009(2009-04-08)
Source	self-made with gnuplot using data file “finals.all” available from http://maia.usno.navy.mil/
Author	User:Tomia, Petr Kadlec
Permission (Reusing this image)	See below.
Other versions	Image:Leapsecond.ut1-utc.png (slightly reworked version that is now out of date at: Image:Leap second history.svg)

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The source code of this SVG is valid

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following license:

This image is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.

[edit] Source code

Generated using the following scripts:

wget http://maia.usno.navy.mil/ser7/finals.all

cut -c 1-2,3-4,5-6,8-15,58,59-68 --output-delimiter " " finals.all > finals-cut.txt
grep "P" finals-cut.txt > finals-pred.txt
grep "I" finals-cut.txt > finals-iers.txt

gnuplot leapsecs.gnuplot

leapsecs.gnuplot contains commands for gnuplot:

set xdata time
set timefmt "%d/%m/%Y"
set format x "%Y"
set xrange ["01/05/1984":"01/05/2010"]
set yrange [-0.8:0.8]
set grid lt 3 lc 0
unset key
set terminal svg dashed
set output 'Leapsecond.ut1-utc.svg'
plot 'finals-iers.txt' using (sprintf("%02.0f/%02.0f/%04.0f", $3, $2, ($4 <= 51543 ? 1900 + $1 : 2000 + $1))):($6) w l lt 1 lc 2 title 'Measured', 'finals-pred.txt' using (sprintf("%02.0f/%02.0f/%04.0f", $3, $2, ($4 <= 51543 ? 1900 + $1 : 2000 + $1))):($6) w l lt 1 lc 1 title 'Predicted'
set output

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	12:31, 8 April 2009		600×480 (132 KB)	Mormegil	(Oops! The colors were inverted!)
	12:30, 8 April 2009		600×480 (132 KB)	Mormegil	(regenerated using EOP data from 2009-04-02)
	19:28, 5 November 2008		600×480 (556 KB)	Tomia	(Updated image to 2008-11-05 data)
	18:48, 2 April 2007		600×480 (402 KB)	Tomia	(Updated image to 2007-03-29 data)
	00:01, 22 November 2006		600×480 (400 KB)	Tomia	(Updated image to 2006-11-21 data.)
	19:30, 30 July 2006		600×480 (395 KB)	Tomia	({{Information\| \|Description =Plot showing the difference UT1−UTC in seconds. Vertical segments correspond to leap seconds. Red part of graph was prediction (future values) at the time the)