observed on

USAGE SUMMARY

"observed on" is a correct and usable phrase in written English.
It is most commonly used to indicate the date on which something was observed or noticed. For example: The bruise on her arm was first observed on September 4th.

✓ Grammatically correct

News & Media

Science

Human-verified examples from authoritative sources

Exact Expressions

58 human-written examples

And, no guard rails, except a new one observed on a mountain road.

Huffington Post

"There are certain customs that are observed on Sunday mornings.

The New York Times

The holiday was first observed on Jan . 20 , 1986

The New York Times

"Lena Wertmuller was very temperamental," he observed on Wednesday night.

The New York Times

"I didn't agree to that," Judge Friedman observed on Wednesday.

The New York Times

(Though this year, because of the Jewish lunar calendar, it will be observed on May 1).

The New York Times

He was fascinated by the turtles he observed on the Galápagos Islands.

The New York Times - Books

The museum exhibits answered my questions about the curious things I'd observed on the streets.

The New York Times - Travel

When Kane died, a minute's silence was observed on German radio.

The Guardian

Cinco de Mayo, a secular holiday, is observed on the weekend before it falls.

The New York Times

Shiva will be observed on Monday and Tuesday at the home of Margery Thomas.

The New York Times

Expert writing Tips

Best practice

When using "observed on" to refer to dates, ensure the context makes it clear that you are referring to when something was first noticed or recorded. For example: "The symptom was first observed on March 15."

Common error

Avoid using "observed on" when you simply mean to say someone casually saw something. "Observed on" implies a formal or documented observation, not just a fleeting glance.

Linguistic Context

The phrase "observed on" functions as a prepositional phrase, typically modifying a verb or noun to indicate the time or location of an observation. Ludwig AI confirms its correct usage and provides numerous examples across various contexts.

Expression frequency: Very common

Frequent in

Science

41%

News & Media

57%

Wiki

2%

Less common in

Formal & Business

0%

Encyclopedias

0%

Reference

0%

Ludwig's WRAP-UP

In summary, the phrase "observed on" is a grammatically sound and frequently employed prepositional phrase. Ludwig AI validates its usage and provides numerous examples. Predominantly found in news, media, and scientific contexts, the phrase serves to pinpoint the timing or location of an observation, contributing precision to formal documentation and reports. While "observed on" is versatile, it is critical to ensure its usage reflects formal or documented observations rather than casual sightings. Alternative phrases, such as "noted on" or "detected on", can be used to provide subtle variations in meaning, as appropriate.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

Noted on

Focuses more on the act of taking note, rather than the passive observation.

Detected on

Implies the use of instruments or methods to find something.

Recorded on

Highlights the act of making a permanent record of the observation.

Registered on

Suggests an official or formal noting of something.

Identified on

Focuses on the act of recognizing or establishing the identity of something.

Found on

Indicates the discovery of something in a particular location or time.

Witnessed on

Emphasizes personal observation of an event or occurrence.

Experienced on

Highlights a personal encounter or feeling related to the observation.

Perceived on

Focuses on the subjective interpretation of sensory information.

Experienced during

Indicates that something was felt or undergone during a specific time frame.

FAQs

How can I use "observed on" in a sentence?

You can use "observed on" to specify when something was first noticed or recorded. For example: "The effect was first observed on Tuesday" or "The damage was observed on the surface of the material".

What is a good alternative to "observed on"?

Depending on the context, alternatives include "noted on", "detected on", or "recorded on". Choose the alternative that best reflects the nature of the observation.

What does "observed on" imply about the observation?

"Observed on" often suggests a formal or documented sighting, rather than a casual glance. It is frequently used in scientific, medical, or official reports.

Is it correct to use "observed on" for future events?

Generally, "observed on" is used for past events, specifying when something was noticed. For future events, use "will be observed on" or "is scheduled for".