Zah.uni-heidelberg.de - SEO Checker

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Overview of the SEO Check
Meta information
59% 
Page quality
41% 
Page structure
45% 
Link structure
70% 
Server
24% 
External factors
100% 
SEO Score
Response time
0.21 s
File size
33.90 kB
Words
447
Media files
18
Number of links
45 internal / 19 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Welcome to the Centre for Astronomy of Heidelberg University: Zentrum für Astronomie
The title contains the word Welcome to! More content should be covered in the title.
The page title should be shorter than 580 pixels. It is 781 pixels long. Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en-us
Server location: United States of America
The following language is defined by HTML: en-us
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
generatorTYPO3 CMS
viewportwidth=device-width, initial-scale=1
robotsindex,follow
apple-mobile-web-app-capableno
langen-us
og:titleWelcome to the Centre for Astronomy of Heidelberg University
og:site_nameZentrum für Astronomie
x-ua-compatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
There are only 447 words on this page. Good pages should have about 800 words of useful content.
The average number of words per sentence of 9.44 words is low.
21.7% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
The page contains a listing, which indicates a good text layout.
10 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 8 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (12). We recommend using a maximum of 9 tags for this page.
Image SEO
(Somewhat important)
15 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
.../Public/Images/schriftzug_mit_siegel.gifRuprecht-Karls-Universität Heidelberg
...ge/Resources/Public/Images/text_logo.pngZentrum Astronomie
...cessed_/3/6/csm_Gaia_logo_64e7fcc9d0.pngNo alt attribute provided
...essed_/4/4/csm_STRUCTURES_6ec4e6f2d6.pngNo alt attribute provided
...ssed_/5/c/csm_gavologos-2_932c32a792.pngNo alt attribute provided
...cessed_/c/c/csm_RAVE_logo_79781d9374.jpgNo alt attribute provided
...ocessed_/a/c/csm_LBT_Logo_e96a346b90.jpgNo alt attribute provided
...processed_/f/b/csm_Ecogal_836f76d237.jpgNo alt attribute provided
..._processed_/2/6/csm_ZAH_X_df8468cd5d.jpgNo alt attribute provided
...ssed_/0/7/csm_ZAH_Youtube_7d8546d9c9.pngNo alt attribute provided
...processed_/a/2/csm_BH3_en_64696227cf.jpgNo alt attribute provided
...ssed_/4/8/csm_Klare_Small_26d85aaf5e.jpgNo alt attribute provided
...0/2/csm_Wambsganss_small2_21bb88482a.jpgNo alt attribute provided
..._/0/8/csm_Wylezalek_small_9f59a0d1ee.pngNo alt attribute provided
..._/2/6/csm_Wambsganss_2jpg_97354e8060.jpgNo alt attribute provided
...csm_Klessen_Radcliff_port_5316646740.jpgNo alt attribute provided
...d_/6/b/csm_Pasquali_small_c6872a0951.pngNo alt attribute provided
...age/Resources/Public/Images/icon_top.gifzum Seitenanfang/up

Page structure

H1 heading
(Critically important)
Welcome to the Centre for Astronomy of Heidelberg University
The H1 heading contains the words Welcome to! Use important keywords instead.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.
Some headings do not have any content.

Heading structure

Heading levelContent
H1 Welcome to the Centre for Astronomy of Heidelberg University
H2 Empty heading
H4 Gaia Quick Links
H4 GAIA based publications
H4 The Landessternwarte mourns the loss of Dr. Gerhard Klare
H4 Joachim Wambsganss is new director of ZAH
H4 Dominika Wylezalek admitted to the Young Academy
H4 2024 Copernicus Award for Joachim Wambsganss
H4 Ralf Klessen selected as Harvard Radcliffe Institute Fellow
H4 Teaching prize for Anna Pasquali
H4 More news and research highlights ►►►►
H4 Astro & Physics talks in HD
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
2 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are 19 external links on this page.

Found links on this page

LinkAttributesAnchor text
/welcomeAnchor Navigation
/welcomeAnchor Content
https://www.uni-heidelberg.de/External Subdomain IMG-ALT Ruprecht-Karls-Universität Heidelberg
https://zah.uni-heidelberg.de/IMG-ALT Zentrum Astronomie
/welcomeWelcome
/standard-titelAbout ZAH
/institutesInstitutes
/research-groupsResearch Groups
/research-collaborationsResearch Collaborations
/studying-astronomyStudying Astronomy
/talks-seminars-eventsEvents, Seminars, Talks
/publicationsPublications
/gliese-fellowship-programmGliese Fellowship Programm
/outreach-media-contactOutreach & Media Contact
/service/personnelPersonnel
/astronomy-physics-in-heidelbergAstronomy & Physics in Heidelberg
/zah-internal-pagesZAH Internal Pages
/gaiaSubdomain No Text
/gaiaSubdomain Gaia Quick Links
/gaiaNew window Subdomain Gaia @ARI
https://www.cosmos.esa.int/web...New window External Subdomain Gaia @ESA
https://www.cosmos.esa.int/web...New window External Subdomain Gaia DR3
/gaia/outreach/gaiaskyNew window Subdomain Gaia Sky
https://ui.adsabs.harvard.edu/...New window External Subdomain ADS
https://www.structures.uni-hei...External Subdomain No Text
http://www.g-vo.org/External Subdomain No Text
https://www.rave-survey.org/External Subdomain No Text
https://www.lsw.uni-heidelberg...External Subdomain No Text
http://www.ecogal.eu/External Subdomain No Text
https://twitter.com/zah_hdExternal No Text
https://www.youtube.com/user/A...External Subdomain No Text
/service/contactContact
/service/searchSearch
/service/personnelText duplicate Personnel
/de/willkommenDeutsch
/welcomeZentrum für Astronomie
/news/detail/extraordinary-bla...Subdomain No Text
/news/detail/the-landessternwa...A-TITLE The Landessternwarte mourns the loss of Dr. Gerhard Klare
/news/detail/the-landessternwa...Text duplicate The Landessternwarte mourns the loss of Dr. Gerhard Klare
A-TITLE The Landessternwarte mourns the loss of Dr. Gerhard Klare
/news/detail/joachim-wambsgans...A-TITLE Joachim Wambsganss is new director of ZAH
/news/detail/joachim-wambsgans...Text duplicate Joachim Wambsganss is new director of ZAH
A-TITLE Joachim Wambsganss is new director of ZAH
/news/detail/dominika-wylezale...A-TITLE Dominika Wylezalek admitted to the Young Academy
/news/detail/dominika-wylezale...Text duplicate Dominika Wylezalek admitted to the Young Academy
A-TITLE Dominika Wylezalek admitted to the Young Academy
https://www.uni-heidelberg.de/...New window External Subdomain A-TITLE 2024 Copernicus Award for Joachim Wambsganss
https://www.uni-heidelberg.de/...New window External Subdomain Text duplicate 2024 Copernicus Award for Joachim Wambsganss
A-TITLE 2024 Copernicus Award for Joachim Wambsganss
/news/detail/ralf-klessen-sele...A-TITLE Ralf Klessen selected as Harvard Radcliffe Institute Fellow
/news/detail/ralf-klessen-sele...Text duplicate Ralf Klessen selected as Harvard Radcliffe Institute Fellow
A-TITLE Ralf Klessen selected as Harvard Radcliffe Institute Fellow
/news/detail/teaching-prize-fo...A-TITLE Teaching prize for Anna Pasquali
/news/detail/teaching-prize-fo...Text duplicate Teaching prize for Anna Pasquali
A-TITLE Teaching prize for Anna Pasquali
/newsMore news and research highlights ►►►►
/welcomeAnchor IMG-ALT zum Seitenanfang/up
/talks-seminars-events/details...Königstuhl Kolloquium
/talks-seminars-events/details...Text duplicate Königstuhl Kolloquium
/talks-seminars-events/details...Text duplicate Königstuhl Kolloquium
/talks-seminars-eventsmore colloquia ...
A-TITLE Opens internal link in current window
http://www.physik.uni-heidelbe...New window External Subdomain Heidelberg Physics Seminar and Talks Organizer (HePhysTo)
A-TITLE Opens internal link in current window
http://adsabs.harvard.edu/abs/...External Subdomain A&A 689, A60(2024)
/service/personnel/staff-detai...Heidt, J.
http://adsabs.harvard.edu/abs/...External Subdomain PASP 136, i5001(2024)
/service/personnel/staff-detai...Röpke, F. K.
http://adsabs.harvard.edu/abs/...External Subdomain MNRAS 533, 3036(2024)
/publicationsmore publications
A-TITLE Opens internal link in current window
https://www.uni-heidelberg.de/...External Subdomain Imprint
https://www.uni-heidelberg.de/...External Subdomain Privacy statement

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://zah.uni-heidelberg.de/welcome"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The web server version is sent within the HTTP header.
The X-powered header is sent within the response header. (unnecessary)
Performance
(Somewhat important)
This page loads 7 CSS files. This may affect the page load time negatively.
This page loads 8 JavaScript files. This may affect the load time negatively.
The page response time is excellent with 0.21 seconds.
The file size of the HTML document is fine (34 kB).

HTTP Response Header

NameValue
dateTue, 17 Sep 2024 21:33:14 GMT
serverApache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/7.2.34
x-content-type-optionsnosniff
x-powered-byPHP/7.2.34
content-languageen
cache-controlprivate, no-store
content-length34736
content-typetext/html; charset=utf-8
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 29 referring domains.
This page has 71 backlinks.
This page has backlinks from 28 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

No valid Robots.txt file was found.

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Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Welcome72%Check
Heidelberg68%Check
Astro68%Check
Heidelberg University65%Check
Astronomy Heidelberg64%Check
Astronomy62%Check
Centre62%Check
University61%Check
Physics and Astronomy49%Check
Astronomie47%Check
Show more keywords and terms

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