<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_up(coordinate, current_time):
 """ Given the position and time determin if the given target is up. @param coordinate: the J2000 location of the source @param current_time: The time of the observations @return: True/False """

    cfht.date = current_time.iso.replace('-', '/')
    cfht.horizon = math.radians(-7)
    sun.compute(cfht)
    sun_rise = Time(str(sun.rise_time).replace('/', '-'))
    sun_set = Time(str(sun.set_time).replace('/', '-'))

    if current_time < sun_set or current_time > sun_rise:
        return False

    fb._ra = coordinate.ra.radian
    fb._dec = coordinate.dec.radian
    cfht.horizon = math.radians(40)
    fb.compute(cfht)
    fb_rise_time = Time(str(fb.rise_time).replace('/', '-'))
    fb_set_time = Time(str(fb.set_time).replace('/', '-'))

    if (current_time > fb_set_time > fb_set_time or
       fb_rise_time > current_time > fb_set_time):
        return False
    return True