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.