[AstroPy] time conversion between JD and UT
ghang.naoc at gmail.com
Thu Sep 4 11:01:44 EDT 2014
You mean jd2 is very small? It can be as large as,say, 0.3.
On Thu, Sep 4, 2014 at 10:54 PM, Tim Jenness <tim.jenness at gmail.com> wrote:
> On Thu, Sep 4, 2014 at 4:59 AM, gonghang.naoc <ghang.naoc at gmail.com>
>> Hi all,
>> I am trying astropy.time to do conversion between JD and UT.
>> It is easier to convert UT to JD. It seems JD equals jd1+jd2, right? I
>> do not know why there are two parts since one value is enough.
> There are two values to allow you use high precision. A single double
> precision number can not provide you with nanosecond precision as a JD. If
> you split the JD into two distinct numbers (apportioned in a way that best
> suits your requirements) you can retain accuracy.
> Tim Jenness
> AstroPy mailing list
> AstroPy at scipy.org
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