Midnight or Noon are easy to track when they happen, and are measurable any time of the year. Sunrise varies, so you'd have to accurately track when the equinoxes are, and then accurately measure when sunrise happens, and then have an accurate clock to keep that time for the other 363 days of the year. We've only reliably been able to do that for a couple of hundred years. The definition of 'day' predates that by centuries.
(By the way: In tropical areas, it's not uncommon for the historic 'day' to start at sunrise. Of course, sunrise varies by at most an hour over the course of a year for many of them.)
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.