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\rhead{Earth, Moon, and Planets Lab (Tue 7-10pm)}
\chead{}
\lhead{Exercise set 1}
\renewcommand{\rightmark}{}
\lfoot{Roban Hultman Kramer} \cfoot{\thepage} \rfoot{Spring 2006}

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\begin{document}
\section{Discussion: The sky}

\begin{enumerate}

\item Make a list of things that can be seen in the sky. 

\item Categorize your items as Terrestrial/Atmospheric, Orbiting the Earth,
  Orbiting the Sun, Outside the Solar System, or Other.

\item How long does it take for the things you see in each category to
  move or change noticeably relative to things on the ground (you can
  give a range)?

\item For non-terrestrial objects: How long does it take for the
  things you see in each category to move or change noticeably
  relative to the ``background'' of distant stars (or galaxies)?

\end{enumerate}

Example: \textit{Airplane -- T/A -- seconds to minutes}.

\section{Discussion: The solar system}

\begin{enumerate}

\item Make a list of kinds of things in the solar system and list the planets

\item Put everything in order of distance from the Sun, where applicable

\item Draw a schematic of the solar system showing where you might
  find each planet or kind of object (don't worry about scale for
  now).

\end{enumerate}

\section{On paper: The sidereal day}

\subsection*{Materials} optional: globe or celestial globe

\subsection*{Instructions}

The sidereal day is the (average) time it takes for the Earth to make
exactly one full rotation (360 degrees). The solar day is the
(average) time it takes the Earth to rotate far enough for the Sun to
be over the same longitude on the Earth (i.e. the time between two
successive local noons). This exercise will help you to figure our why
these time periods are slightly different, and by how much.

Quick reminder about angles: there are 360\degree (degrees) in a
circle, each degree is divided into 60\arcmin (arc minutes), and each
arc minute is divided into 60\arcsec (arc seconds).

\textbf{Do the following in your lab notebook. Make sure your answers
  are clear. Don't worry, this should not be to scale.}

Draw the Earth's orbit around the Sun looking down from the North
Celestial Pole. Which direction does the Earth rotate on its axis?
Which direction does the Earth orbit the sun? (Draw arrows!) 

Draw a circle to represent the Earth at a certain point in its orbit.
Draw another circle representing the Earth's location 24 hours later
(you can exaggerate how far it would have moved). 

Let's say you are standing on the Earth at noon on the first day.
Indicate where on the surface of the Earth you would be standing and
draw an arrow toward the Sun. Do the same for the next day's position.

No let's say you have a friend on the opposite side of the Earth
looking up into the night sky when it is noon your time. Draw your
friend and an arrow indicating the direction they are looking when
they look straight up. Do the same for the next day. If your friend
sees a star directly overhead when it is noon your time on the first
day, will she see the same star in exactly the same position 24 hours
later? Does the star appear overhead before or after 24 hours have
elapsed?

Now let's do a little math:

\begin{itemize}
\item How many degrees does the Earth move in its orbit around the sun in
24 hours? 
\item How many degrees does the Earth rotate in 24 hours? 
\item What is the angular speed of the Earth's rotation in degrees per
  hour, in arc minutes per minute, in arc seconds per second?
\item How long does it take the Earth to rotate 360\degree?
\item What is the difference between the length of the solar and
  sidereal day and which is shorter? 
\item How long is the sidereal day (hours, minutes, and seconds)?
\end{itemize}

\section{Indoor: visualizing the sky}

\subsection*{Materials} seasonal sky chart or planisphere

\subsection*{Instructions}

Orient a planisphere or sky chart for the current season with the real
cardinal directions (roughly). Pick out a few of the brightest
constellations and visualize being outside and looking up to see them
in the sky. What direction would you face? How high up in the sky
would the constellation appear?

Actually practice this indoors: face in the appropriate direction and
point up at the angle above the horizon where you expect the
constellation to appear. Now swing your arm to indicate the path of
the constellation through the sky over the course of the night.

\section{Computer: using planetarium software}

\subsection*{Materials}

computer with planetarium software, ``Seasonal Objects: Winter'' (p.38-39, \textit{Turn Left At Orion} 2nd Edition: 1998, Consolmagno
and David, Cambridge University Press)

\subsection*{Instructions}

Make sure each person understands how to do the following:

\begin{enumerate}

\item Figure out how to set the time and viewing location. View the
  sky as it looks right now from our current location.

\item Find the current seasonal ``guideposts'' from the \textit{Turn
    Left at Orion} book.

\item \textbf{Find out what planets will be up tonight and where they
    are in the sky and record this in your lab notebook.} Think about
  going out on the roof at 9pm: \textbf{what direction would you face
    to see each planet that is up then, and how high up in the sky
    will it be?} Answer the same questions for April 25, the date of
  our last lab.

\end{enumerate}



\end{document}
