ASTRONOMYNOTES.COM Astronomy Notes

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Mobile usability score of astronomynotes.com (66/100) is better than the results of 14.96% of other sites and means that the page is not mobile-friendly.

Mobile speed score of astronomynotes.com (97/100) is better than the results of 95.14% of other sites and shows that the landing page performance on mobile devices is excellent.

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Domain Name: ASTRONOMYNOTES.COM
Registry Domain ID: 30660433_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.fastdomain.com
Registrar URL: http://www.fastdomain.com
Updated Date: 2024-06-15T06:57:20Z
Creation Date: 2000-06-30T20:01:11Z
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astronomynotes.com desktop page speed rank

Last tested: 2019-01-03


Desktop Speed Good
97/100

astronomynotes.com Desktop Speed Test Quick Summary


priority - 1Leverage browser caching

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astronomynotes.com Desktop Resource Breakdown

Total Resources13
Number of Hosts5
Static Resources8
JavaScript Resources3
CSS Resources2

astronomynotes.com mobile page speed rank

Last tested: 2019-01-03


Mobile Speed Good
97/100

astronomynotes.com Mobile Speed Test Quick Summary


priority - 1Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

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priority - 1Optimize images

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Compressing https://www.google.com/cse/static/css/v2/clear.png could save 898B (88% reduction).

priority - 0Minify CSS

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astronomynotes.com Mobile Resource Breakdown

Total Resources13
Number of Hosts5
Static Resources8
JavaScript Resources3
CSS Resources2

astronomynotes.com mobile page usability

Last tested: 2019-01-03


Mobile Usability Medium
66/100

astronomynotes.com Mobile Usability Test Quick Summary


priority - 39Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

Currently thes…ronomy terms. and 15 others render only 6 pixels tall (16 CSS pixels).

How to navigat…n this website and 3 others render only 7 pixels tall (19 CSS pixels).

Purchase the A…my Notes book! and 2 others render only 6 pixels tall (16 CSS pixels).

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View animation of cover renders only 6 pixels tall (16 CSS pixels).

Author of and 2 others render only 6 pixels tall (16 CSS pixels).

Contents (chap…descriptions): and 1 others render only 6 pixels tall (16 CSS pixels).

copyright notice and 4 others render only 6 pixels tall (16 CSS pixels).

Study Skills:…work and exams and 34 others render only 6 pixels tall (16 CSS pixels).

. This chapter…ring systems. and 20 others render only 6 pixels tall (16 CSS pixels).

of nature…sets include: and 20 others render only 6 pixels tall (16 CSS pixels).

Although the h…other schools. and 3 others render only 6 pixels tall (16 CSS pixels).

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Updated Rosett…v-Gerasimenko. renders only 6 pixels tall (16 CSS pixels).
Angular Momentum in Astronomy and 5 others render only 6 pixels tall (16 CSS pixels).
. A bimonthly…scussed on the and 5 others render only 6 pixels tall (16 CSS pixels).
Astronomy beyond this website: renders only 6 pixels tall (16 CSS pixels).
Astronomy on the Web and 2 others render only 6 pixels tall (16 CSS pixels).
. Links to mor…f out there! and 2 others render only 6 pixels tall (16 CSS pixels).
(Select the li…ke a donation) renders only 7 pixels tall (19 CSS pixels).
Is this page a…tronomy Notes? renders only 5 pixels tall (13 CSS pixels).
Nick Strobel and 1 others render only 6 pixels tall (16 CSS pixels).

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

priority - 3Size tap targets appropriately

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The tap target <a href="#details">Jump to Chapters listing</a> is close to 1 other tap targets.

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The tap target <a href="purchase.htm">Purchase the A…my Notes book!</a> and 2 others are close to other tap targets.

The tap target <a href="copyright.htm">copyright notice</a> and 1 others are close to other tap targets.

The tap target <a href="pseudoscience.html">Pseudoscience…ience article.</a> is close to 1 other tap targets.

The tap target <a href="bogus-science-sevensigns.html">The Seven Warn…Bogus Science</a> and 4 others are close to other tap targets.

The tap target <a href="glossary/glossin.htm">Glossary</a> and 1 others are close to other tap targets.
The tap target <a href="astrlink.htm">Astronomy on the Web</a> and 2 others are close to other tap targets.

astronomynotes.com HTML validation

Errors

Start tag seen without seeing a doctype first. Expected “<!DOCTYPE html>”.

Line: 1 Column: 1 - 6
"...<html> <head..."

Attribute “value” not allowed on element “meta” at this point.

Line: 5 Column: 1 - 32
"...s</title> <meta name="description" value="Astronomy notes by Nick Strobel for an introductory astronomy course."> <meta..." Line: 13 Column: 1 - 43
"...course."> <meta name="keywords" value="Astronomy, Education, Teaching, Physics, naked eye astronomy, light, electromagnetic radiation, telescope, planet, solar system, star, stellar properties, magnitude, spectral type, HR diagram, Hertzsprung-Russell Diagram, Sun, fusion, comet, meteorite, stellar structure, stellar interior, life, birth, death, universe stellar evolution, stellar remnants, galactic structure, Milky Way, extra-galactic astronomy, Hubble Constant, Hubble Law, cosmology, extra-terrestrial life, scientific method"> <meta..." Line: 14 Column: 1 - 44
"... method"> <meta name="resource-type" value="document"> <meta..." Line: 15 Column: 1 - 41
"...ocument"> <meta name="distribution" value="global"> <scri..."

Element “meta” is missing one or more of the following attributes: “content”, “property”.

Line: 5 Column: 1 - 32
"...s</title> <meta name="description" value="Astronomy notes by Nick Strobel for an introductory astronomy course."> <meta..." Line: 13 Column: 1 - 43
"...course."> <meta name="keywords" value="Astronomy, Education, Teaching, Physics, naked eye astronomy, light, electromagnetic radiation, telescope, planet, solar system, star, stellar properties, magnitude, spectral type, HR diagram, Hertzsprung-Russell Diagram, Sun, fusion, comet, meteorite, stellar structure, stellar interior, life, birth, death, universe stellar evolution, stellar remnants, galactic structure, Milky Way, extra-galactic astronomy, Hubble Constant, Hubble Law, cosmology, extra-terrestrial life, scientific method"> <meta..." Line: 14 Column: 1 - 44
"... method"> <meta name="resource-type" value="document"> <meta..." Line: 15 Column: 1 - 41
"...ocument"> <meta name="distribution" value="global"> <scri..."

The “bgcolor” attribute on the “body” element is obsolete. Use CSS instead.

Line: 32 Column: 1 - 35
"...> </head> <body bgcolor="white" text="black"> <h1 ..."

The “text” attribute on the “body” element is obsolete. Use CSS instead.

Line: 32 Column: 1 - 35
"...> </head> <body bgcolor="white" text="black"> <h1 ..."

The “align” attribute on the “h1” element is obsolete. Use CSS instead.

Line: 34 Column: 1 - 19
"..."black"> <h1 align="center">Astron..."

Element “gcse:search” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

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"...</script> <gcse:search></gcse..."

The “width” attribute on the “table” element is obsolete. Use CSS instead.

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"...> </div> <table width="653" border="0"> <tr..."

The “border” attribute on the “table” element is obsolete. Use CSS instead.

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The “width” attribute on the “td” element is obsolete. Use CSS instead.

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"...</h3></td> <td width="361"><h4><a..." Line: 64 Column: 10 - 31
"... </tr><tr> <td width="282" align="center"><img s..."

The “align” attribute on the “td” element is obsolete. Use CSS instead.

Line: 64 Column: 10 - 31
"... </tr><tr> <td width="282" align="center"><img s..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 64 Column: 32 - 77
"...="center"><img src="front.jpg" width="214" height="261"><br> ..."

The “center” element is obsolete. Use CSS instead.

Line: 291 Column: 1 - 8
"...his date) <center><a hre..."

Warnings

The “language” attribute on the “script” element is obsolete. You can safely omit it.

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Element name “gcse:search” cannot be represented as XML 1.0.

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"...</script> <gcse:search></gcse..."

The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.

Line: 108 Column: 1 - 18
"...</a>. <p> <a name="details"><b>Con..."

This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.

Line: 1 Column: 1 - 6
"...<html> <head..."

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