File:Leapsecond.ut1-utc.svg

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Original file ‎(SVG file, nominally 600 × 480 pixels, file size: 301 KB)

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Summary

Description

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.

Čeština: Graf zobrazující rozdíl UT1−UTC v sekundách. Svislé úseky odpovídají přestupným sekundám. Červená část je předpověď budoucích hodnot (v okamžiku vytvoření grafu).

Date

2017-01-05, last update 2024-01-03

Source

Own work using: https://maia.usno.navy.mil/ser7/finals.all

Author

Tomia (talk · contribs)
Petr Kadlec (talk · contribs)
Gordon P. Hemsley (talk · contribs)
RP88 (talk · contribs)

Permission
(Reusing this file)

This work 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.

	This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
	The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. CC0falsefalse

Other versions

Original PNG image (2005)
Derivative SVG image (2008)

SVG development

The SVG code is valid.

This plot was created with Gnuplot.

Source code

Generated using the following scripts:

wget https://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 5.0:

set xdata time
set timefmt "%Y-%m-%d"
set format x "%Y"
set xrange ["1973-01-01":"2026-01-01"]
set yrange [-0.9:0.9]
set grid lt 3 lc 0
set terminal svg font "Arial,16"
set style line 1 lc rgb 'dark-green' lt 1
set style line 2 lc rgb 'red' lt 1
unset key
makedate(y,m,d,j) = sprintf("%04d-%02d-%02d", (j <= 51543 ? 1900 + y : 2000 + y), m, d)
set output 'Leapsecond.ut1-utc.svg'
plot \
    'finals-iers.txt' \
        using (makedate($1,$2,$3,$4)):($6) \
        with lines linestyle 1 title 'Measured', \
    'finals-pred.txt' \
        using (makedate($1,$2,$3,$4)):($6) \
        with lines linestyle 2 title 'Predicted'
set output

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	02:57, 3 January 2024	600 × 480 (301 KB)	RP88	Updated to use data available as of 2024-01-03. Prediction through 2025.
	03:17, 4 August 2023	600 × 480 (298 KB)	RP88	Updated to use data available as of 2023-08-03. Prediction through 2024.
	15:17, 30 September 2022	600 × 480 (246 KB)	Mormegil	updated to current data
	08:59, 1 April 2022	600 × 480 (242 KB)	Mormegil	updated to current data
	09:02, 4 January 2021	600 × 480 (238 KB)	Mormegil	updated to current data
	08:16, 29 April 2020	600 × 480 (235 KB)	Mormegil	update data
	14:00, 24 September 2019	600 × 480 (234 KB)	Mormegil	updated to current data with prediction until 2020-09
	10:46, 23 January 2019	600 × 480 (231 KB)	Mormegil	updated to current data
	07:47, 13 August 2018	600 × 480 (229 KB)	Mormegil	updated to current data
	21:34, 5 January 2017	600 × 480 (221 KB)	RP88	Updated to use data available as of 2017-01-05, post leap second.
	13:00, 1 December 2016	600 × 480 (220 KB)	Mormegil	updated data, expanded to 2018-01-01
	13:58, 9 February 2016	600 × 480 (212 KB)	Mormegil	updated to current data, displayed data expanded to 2017-01-01
	00:10, 2 July 2015	600 × 480 (213 KB)	RP88	Updated to use data available as of 2015-07-01, post leap second. Updated to use gunplot 5.0.
	12:13, 15 April 2015	600 × 480 (210 KB)	GPHemsley	Appropriately generate graph using date range 1973-01-01 to 2015-06-30.
	11:04, 15 April 2015	600 × 480 (210 KB)	GPHemsley	Updated to use data available as of 2015-04-15 06:59:35-04:00. Increased range of x-axis to show all available data. Increased range of y-axis to match possible value range of −0.9 s < DUT1 < +0.9 s.
	15:07, 6 January 2015	600 × 480 (149 KB)	Mormegil	updated to current data (with a small manual tweak to “predict” the leap second to be inserted in June)
	00:59, 4 January 2014	600 × 480 (151 KB)	Rumaroder	updated to current data
	13:09, 9 April 2013	600 × 480 (143 KB)	Mormegil	workaround for bugzilla:46540 (wrong interpretation of the “green” CSS keyword): replaced green with explicit #008000
	14:38, 25 March 2013	600 × 480 (143 KB)	Mormegil	updated to current data
	13:46, 10 July 2012	600 × 480 (145 KB)	Mormegil	update to current data after the June leap second