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This tool is used to plot the visibility of celestial objects at a given location and time. Input format:

longitude (in degrees), latitude (in degrees), elevation (in meters)
time zone (e.g., Asia/Shanghai)
object1 RAhh RAmm RAss +DECdd DECmm DECss
object2 RAhh RAmm RAss -DECdd DECmm DECss

You can use today to plot the visibility for today. Object names can be arbitrary strings without white spaces. The RA and DEC are in sexagesimal format.