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@@ -0,0 +1,147 @@ +.TH BLUE 1 BLUE +.SH "NAME" +blue - Creates table of when the blue hour etc. occurs +.SH "SYNPOSIS" +.nf +\fBblue\fP [\fB-d\fP \fIdelev\fP]* [\fB-D\fP \fIdelev\fP]* [\fB-e\fP \fIelev\fP]* [\fB-m\fP \fIelev\fP]* [\fB-h\fP [\fB-L\fP] | \fB-u\fP | \fB-L\fP] + [\fB-l\fP \fIlat\fP\fB:\fP\fIlon\fP | \fB-l\fP \fIloc\fP] [\fB-s\fP \fIyear\fP\fB-\fP\fImonth\fP\fB-\fP\fIday\fP | \fB-s\fP \fB-\fP] [\fB-r\fP \fInum\fP[\fBh\fP|\fBm\fP|\fBs\fP]] + [\fB-bBgGnN\fP] +.fi +.SH "DESCRIPTION" +.B blue +prints a list of time point when the select event occurs. +.SH "OPTIONS" +.TP +.B \-b +List the time when the blue hour begins. (default) +.TP +.B \-B +List the time when the blue hour ends. +.TP +\fB\-d\fP \fIDELEV\fP +List the time when the first derivative of the Sun's elevation is +.I DELEV +and the Sun's elevation is non-negative (daytime). +.TP +\fB\-D\fP \fIDELEV\fP +List the time when the first derivative of the Sun's elevation is +.I DELEV +and the Sun's elevation is non-positive (nighttime). +.TP +\fB\-e\fP \fIELEV\fP +List the time when the Sun's elevation is +\I ELEV +and the first derivative of the Sun's elevation is +non-positive (evening). +.TP +.B \-g +List the time when the golden hour begins. +.TP +.B \-G +List the time when the golden hour ends. +.TP +.B \-h +Print times in human readable format. +.TP +\fB\-l\fP \fILATITUDE\P:\fILONGITUDE\fP +Tell blue where you are. The values are measured in degrees +and in the GPS (you probably do not have too care about that, +the differences between the systems should not be significant +another), and must be in decimal. + +Reminder for Americans (particularly US Americans), you are +an the western hemisphere, not the eastern, thus your longtiude +is negative. If you experience weird time listings, 100 % of +the times it is because you forgot the minus sign. But no need +to feel stupid, it is a really common mistake. + +No complicated stuff please, only latitudes within ±90° and +longitudes within ±180°. No unit thought. +.TP +\fB\-l\fP \fILOCATION\fP +Use a named location. In particular, the one stored in the +file +.RI ~/.config/geolocation.d/ LOCATION , +or the file +.IR LOCATION , +if it begins with either ./ (dot slash), ../ (dot dot slash), +or / (slash). By default ~/.config/geolocation, or /etc/geolocation +as a fallback, is used. +.TP +.B \-L +Print times in local time. +.TP +\fB-e\fP \fIELEV\fP +List the time when the Sun's elevation is +.I ELEV +and the firs derivative of the Sun's elevation is +non-negative (morning). +.TP +.B \-n +List the time of solar noon. +.TP +.B \-N +List the time of solar midnight. +.TP +\fB\-r\fP \fIRES\fP +Print the in +.I RES +resultion. +.I RES +must be an integer followed by on the the suffixes: + +.nf +h hours +m minutes (min is not a valid suffix) +s seconds +.fi + +For example: +.B \-r 15m +prints the nearest quarters of the times. +.TP +\fB\-s\fP \fIDATE\fP +The last date (local time) to include in the last. +.I DATE +must be in +.B %Y-%m-%d +(year dash month dash day) format. +A dash (-) for an infinite list. Default limit is one month. +.TP +.B \-u +Print times in UNIX-time format. +.SH "FILES" +.TP +.B ~/.config/geolocation +Used to get your location if +.B \-l +is not used. This file contains +your geographical location using the Global Positioning System +in decimal format. This will never change. Other programs are +encouraged to use this file too. + +If the file contains more than one line, only the first line, +even if it is empty, is used. +.TP +.B /etc/geolocation +Fallback file use if ~/.config/geolocation is missing. Other +programs are encouraged to use this file too. +.TP +.B ~/.config/geolocation.d/ +Directory used for named locations. The files are formatted +in the same way as ~/.config/geolocation. Other programs are +encouraged to use this directory too. +.TP +.B /etc/geolocation.d/ +Directory used for named locations, used when the named +location is not listed in ~/.config/geolocation.d/. The files +are formatted in the same way as ~/.config/geolocation. Other +programs are encouraged to use this directory too. +.SH "RATIONALE" +This is useful if you plan to take nice photographies, for example +during the blue hours, or the golden hour. +.SH "NOTES" +US Americans, remember, you are on the Western Hemisphere. +Therefore, you should specify a negative longitude. +.SH "SEE ALSO" +.BR locateme (1) |