[AstroPy] How to plot a time format with hours only?

[Miro Saide]

Hi Eric,

I wonder if is there a way to approximate the minutes to our when I
calculate the rise and set time?


*Ramiro Caisse Saide*
*MPhil Research Student*
Department of Physics
University of Mauritius
Contact Number: +258 845672884
Email: ramiro.saide at umail.uom.mu




Eric Jensen <ejensen1 at swarthmore.edu> escreveu no dia sexta, 23/04/2021
à(s) 15:04:

> Hi Ramiro,
>
> I think you should be able to get just the hour of the rise or set time by
> using
>
> star_rise_time.ymdhms.hour
>
> If you want other components as well, you can use .year, .minute, etc.
> with that ymdhms format.
>
> Hope this helps -
>
> Eric
>
>
> On Apr 23, 2021, at 5:44 AM, Miro Saide <mirosaide at gmail.com> wrote:
>
> Hello all,
>
> I am using the following code to plot the rise and set of a particular
> star from a selected location on earth:
>
> import numpy as np
> import matplotlib.pyplot as plt
> from astropy.visualization import astropy_mpl_style, quantity_support
> plt.style.use(astropy_mpl_style)
> quantity_support()
> import astropy.units as u
> from astropy.time import Time
> from astropy.coordinates import SkyCoord, EarthLocation, AltAz
> from astroplan import download_IERS_A
> download_IERS_A
> from astroplan import Observer, FixedTarget
>
> #Latitude and LOngitude of some cities
> cities =
> [[-25.9553,32.5892],[-25.7069,28.2294],[-15.4166,28.2833],[-22.95764,18.49041],[-13.254308,34.301525]]
> cities = np.array(cities)
>
> time = Time("2000-11-12 11:00:00",format='iso')
>
> #Star target
> target = SkyCoord.from_name("Barnard's star")
>
>
> #Calculation of the rise and set time
> Location = Observer(latitude=cities[:,0]*u.deg,
> longitude=cities[:,1]*u.deg)
> star_rise_time = Location.target_rise_time(time, target, which='next')
> star_set_time = Location.target_set_time(time, target, which='next')
>
> #Get the time in iso format
> rise_1 = star_rise_time.iso
> set_1 = star_set_time.iso
>
>
> #Random values
> Random_valeus = [1600,2118,3000,2750,3500]
>
>
> #Plot the time against random values
>
> plt.plot(rise_1,Random_valeus, marker ='o',label = 'rise')
> plt.plot(set_1,Random_valeus, marker ='o',label = 'set')
> plt.xlabel('Time [Hours]')
> plt.ylabel('Random_valeus')
> plt.show()
>
> When I run this the time axis in the plot gets messy the values overlap
> and can't clearly see what is what.
>
> I wonder if there's is a way to plot this with hours only, neglecting the
> year, month, day, minutes, and seconds?
>
> Thanks in advance.
>
> *Ramiro Caisse Saide*
> *MPhil Research Student*
> Department of Physics
> University of Mauritius
> Contact Number: +258 845672884
> Email: ramiro.saide at umail.uom.mu
>
>
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