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index 85a8e391..c57f0e84 100644
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@@ -828,7 +828,7 @@ <h3 class="callout-title">Exercise (3 minutes)<a class="anchor" aria-label="anch
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 <div class="accordion-body">
 <p>For example, we can add radial_velocity : Radial velocity (double,
 Velocity[km/s] ) - Spectroscopic radial velocity in the solar
@@ -989,7 +989,7 @@ <h3 class="callout-title">Exercise (5 minutes)<a class="anchor" aria-label="anch
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 <p>In this example, the WHERE clause is in the wrong place.</p>
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 <div class="accordion-body">
 <p>Here is a solution using <code>&gt;</code> and <code>&lt;</code>
 operators:</p>
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index 112d16a5..8bba4a4a 100644
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+++ b/02-coords.html
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diff --git a/03-transform.html b/03-transform.html
index 5c80dfd8..3bd6cc5a 100644
--- a/03-transform.html
+++ b/03-transform.html
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diff --git a/04-motion.html b/04-motion.html
index 28604b8f..dfe70d68 100644
--- a/04-motion.html
+++ b/04-motion.html
@@ -365,7 +365,7 @@ <h3 class="callout-title">Starting from this episode<a class="anchor" aria-label
   <h3 class="accordion-header" id="headingSpoiler1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Read me</h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
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 <div class="accordion-body">
 <p>Previously, we ran a query on the Gaia server, downloaded data for
 roughly 140,000 stars, transformed the coordinates to the GD-1 reference
@@ -451,7 +451,7 @@ <h3 class="callout-title">Exercise (10 minutes)<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="accordion-body">
 <p>The most noticeable issue is that some of the parallax values are
 negative, which seems non-physical.</p>
@@ -918,7 +918,7 @@ <h3 class="callout-title">Exercise (5 minutes)<a class="anchor" aria-label="anch
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diff --git a/05-select.html b/05-select.html
index c7481c80..4acdb5da 100644
--- a/05-select.html
+++ b/05-select.html
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diff --git a/06-join.html b/06-join.html
index d52af0b2..0042e6a3 100644
--- a/06-join.html
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   "dateCreated": "2020-05-11",
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diff --git a/07-photo.html b/07-photo.html
index b9416755..f68a2d38 100644
--- a/07-photo.html
+++ b/07-photo.html
@@ -370,7 +370,7 @@ <h3 class="callout-title">Starting from this episode<a class="anchor" aria-label
   <h3 class="accordion-header" id="headingSpoiler1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Read me</h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
 <div class="accordion-body">
 <p>In the previous episode, we selected stars in GD-1 based on proper
 motion and downloaded the spatial, proper motion, and photometry
@@ -433,7 +433,7 @@ <h3 class="callout-title">A slight detour for non-domain experts<a class="anchor
   <h3 class="accordion-header" id="headingSpoiler2">
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 </button>
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 <p>As a pathologist can easily point to tumor on a biopsy slide, so too
 can astronomers who study stellar populations see two stellar main
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diff --git a/08-plot.html b/08-plot.html
index e795c37c..3c8a2033 100644
--- a/08-plot.html
+++ b/08-plot.html
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diff --git a/404.html b/404.html
index ca456900..38a59a89 100644
--- a/404.html
+++ b/404.html
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   "identifier": "https://datacarpentry.github.io/astronomy-python/404.html",
   "dateCreated": "2020-05-11",
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index 36400ed2..274ccf0c 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
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   "identifier": "https://datacarpentry.github.io/astronomy-python/CODE_OF_CONDUCT.html",
   "dateCreated": "2020-05-11",
   "dateModified": "2023-05-15",
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   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index 44893333..d8c0fdbc 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -403,7 +403,7 @@ <h1>Licenses</h1>
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   "dateCreated": "2020-05-11",
   "dateModified": "2023-05-15",
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index 3d64f2c1..c0b953be 100644
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   <h4 class="accordion-header" id="headingSolution1">Show me the solution</h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>For example, we can add radial_velocity : Radial velocity (double,
 Velocity[km/s] ) - Spectroscopic radial velocity in the solar
@@ -1051,7 +1051,7 @@ <h3 class="callout-title">Exercise (5 minutes)<a class="anchor" aria-label="anch
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <p>In this example, the WHERE clause is in the wrong place.</p>
 <div class="codewrapper">
@@ -1137,7 +1137,7 @@ <h3 class="callout-title">Exercise (5 minutes)<a class="anchor" aria-label="anch
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
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 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here is a solution using <code>&gt;</code> and <code>&lt;</code>
 operators:</p>
@@ -1322,7 +1322,7 @@ <h3 class="callout-title">Exercise (10 minutes)<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <div class="codewrapper sourceCode" id="cb47">
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@@ -1577,7 +1577,7 @@ <h3 class="callout-title">Exercise (5 minutes)<a class="anchor" aria-label="anch
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -1884,7 +1884,7 @@ <h3 class="callout-title">Exercise (10 minutes)<a class="anchor" aria-label="anc
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
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 <p>The most noticeable issue is that some of the parallax values are
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 <p>In the previous episode, we selected stars in GD-1 based on proper
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 <p>Previously, we ran a query on the Gaia server, downloaded data for
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 <p>In the previous episode, we selected stars in GD-1 based on proper
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 }
 
   </script><script>
diff --git a/link-list.html b/link-list.html
index a9be8264..54f4b22b 100644
--- a/link-list.html
+++ b/link-list.html
@@ -510,7 +510,7 @@ <h1>Link List</h1>
   "identifier": "https://datacarpentry.github.io/astronomy-python/link-list.html",
   "dateCreated": "2020-05-11",
   "dateModified": "2023-05-15",
-  "datePublished": "2024-05-14"
+  "datePublished": "2024-05-21"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index fc88d743..f2d3589f 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 3.1.11
 pkgdown: 2.0.9
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-05-14T00:04Z
+last_built: 2024-05-21T00:05Z
 
diff --git a/prereqs.html b/prereqs.html
index 6927c931..b099a28d 100644
--- a/prereqs.html
+++ b/prereqs.html
@@ -403,7 +403,7 @@ <h3 id="python-skills">Python skills<a class="anchor" aria-label="anchor" href="
   "identifier": "https://datacarpentry.github.io/astronomy-python/prereqs.html",
   "dateCreated": "2020-05-11",
   "dateModified": "2023-05-15",
-  "datePublished": "2024-05-14"
+  "datePublished": "2024-05-21"
 }
 
   </script><script>
diff --git a/profiles.html b/profiles.html
index 4d1538a0..4dbf9c8e 100644
--- a/profiles.html
+++ b/profiles.html
@@ -303,8 +303,8 @@ <h1>Learner Profiles</h1>
   "url": "https://datacarpentry.github.io/astronomy-python/profiles.html",
   "identifier": "https://datacarpentry.github.io/astronomy-python/profiles.html",
   "dateCreated": "2020-05-11",
-  "dateModified": "2024-05-14",
-  "datePublished": "2024-05-14"
+  "dateModified": "2024-05-21",
+  "datePublished": "2024-05-21"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index 48cb34c5..6aafa36f 100644
--- a/reference.html
+++ b/reference.html
@@ -344,7 +344,7 @@ <h1>Reference</h1>
   "identifier": "https://datacarpentry.github.io/astronomy-python/reference.html",
   "dateCreated": "2020-05-11",
   "dateModified": "2023-05-15",
-  "datePublished": "2024-05-14"
+  "datePublished": "2024-05-21"
 }
 
   </script><script>