## Find the maximum of a list the long way

import numpy as np

myList = [2, 10, 4, 7]

maxNum = -1.e99
for num in myList:
   if num>maxNum:
      maxNum = num

print maxNum
print np.max(myList)



## print prime numbers and squares

for pnum in [1, 2, 3, 5, 7, 11]:
    print "number=%i, squared=%i" % (pnum, pnum*pnum)



## motion of star

ra  =  15.2345
dec = -45.23435

pmRa  = -1.2
pmDec = 0.35

epoch = 2000.

print "ra in 2009 is  :%f" % (ra + (pmRa/3600.)*(2009-2000) )
print "dec in 2009 is :%f" % (dec + (pmDec/3600.)*(2009-2000) )


## when does it cross -45 exactly?

deltaDec = -45.-dec
deltaTime = deltaDec / (pmDec/3600.) 

print "The time it takes is %f years" % (deltaTime)