- SEO Checker

Overview of the SEO Check
Meta information
Page quality
Page structure
Link structure
External factors
SEO Score
Response time
0.19 s
File size
11.80 kB
Media files
Number of links
44 internal / 4 external

Task list of SEO Improvements

Meta specifications

(Critically important)
Argelander-Institut für Astronomie
The length of the page title is perfect. (302 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
(Critically important)
There are no problems in accessing the website.
Canonical URL
There is a valid canonical link specified.
(Somewhat important)
Language detected in text: de
Language defined in HTML: de
Server location: Germany
The following language is defined by HTML: de
Alternate/Hreflang Links
(Somewhat important)
The specified alternate links have no errors.
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.
(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.
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
(Nice to have)
No favicon is linked in the HTML code.

Meta tags


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Page quality

(Critically important)
There are only 300 words on this page. Good pages should have about 1,000 words of useful content.
The average number of words per sentence of 33.25 words is high.
25.7% 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.
4 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
(Critically important)
This website does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=1400" is provided.
This website only loads 2 JavaScript files. That's good!
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 6 tags for this page.
Image SEO
(Somewhat important)
3 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.
(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

Page structure

H1 heading
(Critically important)
The H1 heading consists of only one word. There should be more information given.
The H1 heading is too short (5 characters). It should be at least 20 Characters long.
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Neues
H2 Argelander Fellowship 2021
H2 Wie Galaxien ihre Sterne produziert haben
H2 Unser tiefster Blick in den Röntgenhimmel
H2 Zweifel an grundsätzlichen Annahmen zum Universum
H2 Mit Start der SRG-Himmelsdurchmusterung beginnt eROSITA seine Mission: die genaueste Karte des ...
Some internal link anchor texts are too long.
Some anchor texts are used more than once.
3 links don't have an anchor text.
The amount of internal links is ok.
All internal links don't have dynamic parameters.
There are 4 external links on this page.
LinkAttributesAnchor text
/de/institut/kontakt-und-anfahrtKontakt und Anfahrt
/de/forschung/dark-energy-teamDark Energy Team
/de/forschung/radioastronomy-ismRadio Astronomy & Interstellar Medium
/de/forschung/gravitational-le...Gravitational Lensing and Cosmology
/de/forschung/mm-submm-astronomyMillimeter/sub-millimeter astronomy
/de/forschung/radio-and-x-ray-...Radio- and X-ray astronomy
/de/forschung/the-large-scale-...The large-scale structure of the Universe
/de/forschung/stellar-astrophy...Stellar Astrophysics
/de/studium/informationen-rund...Informationen rund ums Studium
/de/offentlichkeit/angebote-fu...Angebote für den Bereich Schule
/de/offentlichkeit/angebote-fu...Angebote für die Allgemeinheit
/de/offentlichkeit/geschichte-...Geschichte der Bonner Astronomie
/de/offentlichkeit/sammlung-hi...Sammlung Historischer Himmelsaufnahmen
/de/jobs/afArgelander Fellowship 2021
/de/forschungNo Text
/de/institutNo Text
/en/studentsNo Text
/de/news/2020/09/unnamed/News-afArgelander Fellowship 2021 30.09.2020 The Argelander Institute for Astronomy (AIfA) at the University of Bonn invites applications for the Argelander Postdoc...
/de/news/2020/09/29/unnamedWie Galaxien ihre Sterne produziert haben 29.09.2020 Ein internationales Team von Astronomen, darunter Mitglieder des Argelander-Instituts, nutzte das ALMA-O...
/de/news/2020/06/19/eRosita-FS...Unser tiefster Blick in den Röntgenhimmel 19.06.2020 Das eROSITA-Teleskop liefert Astronomen einen neuen, scharfen Blick auf heiße und energiereiche Prozesse...
/de/news/2020/04/08/unnamedZweifel an grundsätzlichen Annahmen zum Universum 08.04.2020 Studie der Universitäten Bonn und Harvard stellt ein fundamentales Prinzip der Kosmologie in Fra...
/de/news/2019/unnamed/unnamed/...Mit Start der SRG-Himmelsdurchmusterung beginnt eROSITA seine Mission: die genaueste Karte des ... 11.12.2019 Die russisch-deutsche SRG-Mission, die am 13. J...
/de/institut/mitarbeiterText duplicate Mitarbeiter
/de/institut/impressumText duplicate Impressum
/de/institut/datenschutzerklae...Text duplicate Datenschutzerklärung
https://intranet.astro.uni-bon...New window External Subdomain Intranet window Login
/download/New window Downloads
/links/New window Links window External Anchor Podium window External Juan Pablo Bravo Rheinische Friedrich-Wilhelms-Universität Bonn

Server configuration

HTTP redirects
(Critically important)
This website redirects to ""
HTTP header
No X-Powered HTTP header is sent.
This website uses GZip for compressed data transmission.
(Somewhat important)
The page response time is excellent with 0.19 seconds.
This website only loads 1 CSS files. That's ok.
This website only loads 2 JavaScript files. That's good!
The file size of the HTML document is fine (12 kB).

HTTP Response Header

content-typetext/html; charset=UTF-8
dateThu, 26 Nov 2020 10:03:26 GMT
x-flow-poweredFlow/5.3 Neos/4.3

External factors

(Critically important)
This website is not classified "for adult only".
Shallalist classifies this website as Science/astronomy. This classification is fine.
This website is referenced by wikipedia.
This website has excellent links from other websites.
This website has backlinks from 517 referring domains.
This website has 3,734 backlinks.
This website has backlinks from 468 different ip addresses.
Facebook popularity
(Somewhat important)
This website is a little bit popular on facebook.
Listed on Webwiki
(Nice to have)
This website is listed on Webwiki.


User-agent: *
Disallow: /neos/

User-agent: XoviBot
Disallow: /

Facebook popularity

Shares / Likes / Comments

Only the data for the given URL is shown. We cannot determine the social actions for a linked fan page.

Search preview

Most important keywords

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

Institut für Astronomie48%Check
Universität Bonn41%Check

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