2025 Lab 2 updates

Lab_2/Lab_2.ipynb

@@ -4,14 +4,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# <p style=\"text-align: center;\">PHYS 134L Spring 2024 Lab 2</p>"
+    "# <p style=\"text-align: center;\">PHYS 134L Spring 2025 Lab 2</p>"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<div class=\"alert alert-block alert-danger\"><b>Due date:</b> Sunday, April 21th, 2024 by 11:59pm, submitted through Gradescope.</div>"
+    "<div class=\"alert alert-block alert-danger\"><b>Due date:</b> Sunday, April 20th, 2025 by 11:59pm, submitted through Gradescope.</div>"
    ]
   },
   {
@@ -56,7 +56,7 @@
    "metadata": {},
    "source": [
     "We'll begin by revisiting the same datafile that we used in Lab 1: ```object.fits```.\n",
-    "**In ds9, open \\texttt{object.fits}.  Click on ''file/display\\_header'' to display the header.** The entries ''RA'' and ''Dec'' give the coordinates in the sky where the telescope was pointing while taking the image. Also notice the entry\n",
+    "**In ds9, open ```object.fits```.  Click on ''file/display\\_header'' to display the header.** The entries ''RA'' and ''Dec'' give the coordinates in the sky where the telescope was pointing while taking the image. Also notice the entry\n",
     "commented ``start time of the observation.'' This is the time (in Universal Time, or UT) when the shutter opened for the CCD image. UT corresponds to the local time on the prime meridian (longitude = 0 degrees), which passes through the observatory at Greenwich, England. This time zone is 8 hours ahead of Pacific Std Time, and 7 hours ahead of Pacific Daylight Time.\n"
    ]
   },
@@ -92,7 +92,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**On a sheet of paper, sketch a map of the part of the sky where the image was taken large enough to include a couple of bright, named stars (please label them).  Check out the [Stellarium website](https://stellarium-web.org/) if you need some help. Note that RA is defined so that as the Earth turns, the RA of objects on the meridian increases with time. Draw your map with N up and E to the left (as it would appear if you were facing the southern horizon). Attach the drawing to the end of this lab report before you submit it to gradescope.**"
+    "**On a sheet of paper, sketch a map of the part of the sky where the image was taken large enough to include a couple of bright, named stars (please label them).  Check out the Stellarium app installed on the lab computers or the [Stellarium website](https://stellarium-web.org/) if you need some help. Note that RA is defined so that as the Earth turns, the RA of objects on the meridian increases with time. Draw your map with N up and E to the left (as it would appear if you were facing the southern horizon). Attach the drawing to the end of this lab report before you submit it to gradescope.**"
    ]
   },
   {
@@ -511,7 +511,7 @@
    "metadata": {},
    "source": [
     "The size of an astronomical image on the CCD detector depends on the effective focal length (usually abbreviated ''focal length'') of\n",
-    "the telescope. Here is a link to a quick primary on focal length: [Focal length and f/# explained](https://www.paragon-press.com/lens/lenchart.html). This part of the lab will use a fits file called ```cluster.fits``` that should have been downloaded to your JupyterHub account when you clicked the link for this notebook, but it can also be found on the Lab 2 tab on the Canvas site. "
+    "the telescope. This part of the lab will use a fits file called ```cluster.fits``` that should have been downloaded to your JupyterHub account when you clicked the link for this notebook, but it can also be found on the Lab 2 tab on the Canvas site. For the part of the lab, it may benefit to read ahead to Sections 2.2, 2.3 and 2.4 of Burns."
    ]
   },
   {
@@ -523,6 +523,13 @@
     "Explain the origin of the magic number 206264.80. If you get stuck here, read the the primer above and think about the relationship between radians and arcseconds.**"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -790,6 +797,18 @@
    "source": [
     "*You answer here*"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Don't forget to restart your JupyterHub Kernel and re-run all of your cells before submitting! "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": []
   }
  ],
  "metadata": {