Within Useful Data
How Sky Angles Make UFO Claims Testable
Bearings, elevation angles and angular movement are more useful than claims about an object's size or speed when its distance is unknown.
On this page
- Measuring bearing and elevation from the ground
- Why apparent size cannot reveal physical size
- Recording angular paths without confusing camera motion
Page outline Jump by section
Introduction
When people describe a UFO as “enormous”, “tiny”, “moving at impossible speed” or “hovering directly overhead”, those conclusions often depend on an assumption about distance that the witness could not actually measure. By contrast, the direction in which an object was seen and the angle through which it appeared to move across the sky are direct observations. They can be checked against maps, astronomical software, aircraft tracks, satellite predictions and reports from other witnesses. For that reason, bearings, elevation angles and angular motion are among the most valuable pieces of information in a UFO report, whether the witness is an ordinary observer or a celebrity whose account attracts widespread attention. NASA’s independent UAP study similarly emphasised that progress depends on collecting higher-quality, standardised observational data rather than relying on compelling narratives alone.[NASA Science]science.nasa.govScience UAPNASA ScienceUAP - NASA ScienceFebruary 23, 2026…
Measuring bearing and elevation from the ground
The simplest useful measurements describe where an object appeared rather than what it supposedly was.
A complete observation records two angular coordinates:
- Bearing (azimuth): the compass direction, usually measured clockwise from true or magnetic north.
- Elevation (altitude): the angle above the horizon, from 0° on the horizon to 90° at the zenith directly overhead.
These are the same horizon coordinates used throughout observational astronomy because they describe exactly what an observer sees from a known location. Once the observing position and time are known, these angles can be compared with the positions of the Moon, planets, bright stars, satellites or aircraft.[US Naval Observatory]aa.usno.navy.milOpen source on navy.mil.
Even approximate measurements are often useful if they are recorded immediately. For example:
- “Started at bearing 240°, elevation 20°.”
- “Passed beneath Jupiter.”
- “Disappeared behind the western treeline.”
- “Reached about halfway between the horizon and the zenith.”
These observations preserve geometry that investigators can revisit later.
Why angles are more reliable than estimated size or speed
Human observers naturally convert what they see into statements such as “it was as large as a house” or “it crossed the sky at thousands of miles per hour”. Those statements sound quantitative but usually depend on an unknown distance.
Angular measurements avoid this problem because they describe only the object’s apparent position.
For example, if a light appears to move 30° across the sky in ten seconds, the observation is simply an angular velocity of roughly 3° per second. That measurement remains valid regardless of whether the object later proves to have been:
- a nearby drone,
- a high-altitude aircraft,
- a satellite,
- a balloon,[d1kn6o6up31pvd.cloudfront.net]d1kn6o6up31pvd.cloudfront.netIsn’t That A Balloon?Deflating a DoD UFO Video - bellingcatOctober 24, 2023 — Nathan Patin Nathan Patin is a Colorado-based independent researcher and former…
- or something still unidentified.
Only after distance is independently established can that angular motion be converted into a physical speed.
This distinction has been recognised for decades in studies of aerial observations. The Condon Report noted that perceived size, distance and speed strongly influence one another, making unaided human estimates of physical dimensions particularly unreliable when range is unknown.[files.ncas.org]files.ncas.orgCondon Report, Sec VI, Chapter 1 – Perceptual ProblemsCondon Report, Sec VI, Chapter 1 – Perceptual Problems
Why apparent size cannot reveal physical size
One of the most common mistakes in UFO discussions is treating apparent size as though it directly indicates physical size.
The relationship is straightforward:
- A small nearby object can appear identical in size to a huge distant object.
- Without knowing the distance, there is no unique solution for actual size.
A bright point of light at night illustrates the problem particularly well. The visible glow is often determined more by atmospheric scattering, camera exposure and brightness than by the object’s physical dimensions. Consequently, descriptions such as “it filled half the sky” or “it was the size of a football” are meaningful only as descriptions of appearance unless independent distance information exists.
Professional and amateur investigators therefore distinguish between angular size—how much of the observer’s field of view an object occupies—and physical size, which requires additional geometric information. MUFON’s field investigation procedures, for example, explicitly collect angular size, elevation and azimuth separately from any estimated distance.[MUFON]mufon.comThe Scientific MethodThe Scientific Method - MUFON…
Recording angular paths without confusing camera motion
Videos often appear to show extraordinary manoeuvres that are actually produced by camera movement.
To separate object motion from camera motion, it helps to record:
- where the object first appeared,
- its apparent path relative to fixed landmarks or stars,
- every point where the observer intentionally moved the camera,
- moments of zooming,
- and any movement by the observer, such as walking or driving.
Background references are especially valuable. If stars remain fixed while the object changes position, investigators can measure its angular path frame by frame. If both the object and the background move together, the apparent motion may simply result from panning the camera.
Modern video analysis often stabilises footage using buildings, trees or stars before measuring the object’s trajectory. Without those references, dramatic-looking motion can be impossible to interpret confidently.
How multiple witnesses improve angular measurements
Angular observations become substantially more powerful when independent observers record them from different locations.
If two witnesses observe the same object at the same time and each records accurate bearings and elevation angles, the intersecting lines of sight may allow investigators to estimate the object’s location through triangulation. Once range becomes available, previously ambiguous quantities such as altitude, speed and physical size can also be estimated.
This principle is widely used in surveying, astronomy and tracking systems. Scientific proposals for dedicated UAP observing networks similarly emphasise multiple synchronised sensors because position measurements from several viewpoints are far more informative than isolated videos from a single camera.[arXiv]arxiv.orgThe Scientific Investigation of Unidentified Aerial Phenomena (UAP) Using Multimodal Ground-Based ObservatoriesMay 29, 2023…
Common perceptual pitfalls
Several well-known visual effects can distort perceived direction and movement, particularly at night.
Some of the most important include:
- Autokinesis: a stationary point of light viewed against a dark background may appear to drift or wander.
- Poor horizon references: without visible landmarks, observers frequently overestimate elevation, with objects well above the horizon often being reported as “overhead”.
- Relative motion illusions: movement of clouds, vehicles or the observer can make stationary or steadily moving objects appear to accelerate, stop or change direction.
- Camera zoom effects: changing focal length alters apparent motion and size without affecting the object’s actual trajectory.
These effects are extensively documented in aviation safety guidance and perceptual research, illustrating why recorded angular measurements are more dependable than remembered impressions of extraordinary manoeuvres.[files.ncas.org]files.ncas.orgCondon Report, Sec VI, Chapter 1 – Perceptual ProblemsCondon Report, Sec VI, Chapter 1 – Perceptual Problems
Why this matters for evaluating celebrity UFO reports
Celebrity sightings often receive intense media attention, but publicity does not improve the underlying data. A famous witness who reports that an object was “gigantic” or “moving impossibly fast” provides no stronger evidence than any other observer if the report lacks measurable geometry.
Conversely, a relatively unknown witness who records precise bearings, elevation angles, timestamps and an angular path across the sky contributes information that can be independently tested. Those measurements can be compared with astronomical objects, aircraft records, satellite predictions and observations from other locations.
For that reason, viewing direction and angular motion occupy a central place in evidence-based UFO investigation. They preserve what was directly observed while avoiding assumptions about distance, size and speed that cannot be justified from a single viewpoint alone.
Amazon book picks
Further Reading
Books and field guides related to How Sky Angles Make UFO Claims Testable. Use these as the next step if you want deeper reading beyond the article.
UFOs: Generals, Pilots, and Government Officials Go on the Re...
NEW YORK TIMES BESTSELLER • Impeccably researched, this riveting journalistic investigation separates fact from fiction, and documents th...
The Demon-haunted World
Rating: 4.5/5 from 43 Google Books ratings
Are we on the brink of a new Dark Age of irrationality and superstition? In this book, the writer shows how scientific thinking is necess...
The Invisible Gorilla
NEW YORK TIMES BESTSELLER • Our minds don’t work the way we think they do. Two renowned psychologists explain how and why our intuitions...
Eye and Brain
Since the publication of the first edition in 1966, Eye and Brain has established itself worldwide as an essential introduction to the ba...
eBay marketplace picks
Marketplace Samples
Live-tested eBay searches with available results related to this page.
Selected fromUFO poster oneBay.co.uk.
Endnotes
1.
Source: science.nasa.gov
Title: Science UAP
Link:https://science.nasa.gov/uap/
Source snippet
NASA ScienceUAP - NASA ScienceFebruary 23, 2026...
Published: February 23, 2026
2.
Source: files.ncas.org
Title: Condon Report, Sec VI, Chapter 1 – Perceptual Problems
Link:https://files.ncas.org/condon/text/s6chap01.htm
3.
Source: mufon.com
Title: The Scientific Method
Link:https://mufon.com/the-scientific-method/
Source snippet
The Scientific Method - MUFON...
4.
Source: arxiv.org
Link:https://arxiv.org/abs/2305.18566
Source snippet
The Scientific Investigation of Unidentified Aerial Phenomena (UAP) Using Multimodal Ground-Based ObservatoriesMay 29, 2023...
Published: May 29, 2023
5.
Source: nasa.gov
Title: UPDAT E: NASA Shares UAP Independent Study Report; Names Director
Link:https://www.nasa.gov/news-release/update-nasa-shares-uap-independent-study-report-names-director/
Source snippet
UPDATE: NASA Shares UAP Independent Study Report; Names Director - NASASeptember 14, 2023 — 5 min read UPDATE: NASA SHARES UAP INDEPENDEN...
Published: September 14, 2023
6.
Source: files.ncas.org
Link:https://files.ncas.org/condon/text/case50.htm
7.
Source: files.ncas.org
Link:https://files.ncas.org/condon/text/s3chap05.htm
8.
Source: files.ncas.org
Link:https://files.ncas.org/condon/text/s6chap09.htm
9.
Source: files.ncas.org
Link:https://files.ncas.org/condon/text/s6chap02.htm
10.
Source: mufon.com
Title: What is Ufology?
Link:https://mufon.com/what-is-ufology/
11.
Source: files.ncas.org
Link:https://files.ncas.org/ufosymposium/baker.html
12.
Source: files.ncas.org
Title: appndx b
Link:https://files.ncas.org/condon/text/appndx-b.htm
13.
Source: files.ncas.org
Link:https://files.ncas.org/condon/text/case49.htm
14.
Source: aa.usno.navy.mil
Link:https://aa.usno.navy.mil/faq/alt_az
15.
Source: d1kn6o6up31pvd.cloudfront.net
Title: Isn’t That A Balloon?
Link:https://d1kn6o6up31pvd.cloudfront.net/news/2023/10/24/isnt-that-a-balloon-deflating-a-dod-ufo-video/
Source snippet
Deflating a DoD UFO Video - bellingcatOctober 24, 2023 — Nathan Patin Nathan Patin is a Colorado-based independent researcher and former...
Published: October 24, 2023
16.
Source: scribd.com
Title: Condon Report | PDF | Cloud | Sky
Link:https://www.scribd.com/document/718800974/Condon-Report
Additional References
17.
Source: doi.org
Link:https://doi.org/10.5281/Zenodo.10287332
Source snippet
, 1947-2016 | ZenodoDecember 7, 2023 — Published December 7, 2023 | Version v1 Peer review Open THE REPORTED SHAPE, SIZE, KINEMATICS, ELE...
Published: December 7, 2023
18.
Source: youtube.com
Title: A simple guide to azimuth and altitude in the horizontal coordinate system
Link:https://www.youtube.com/watch?v=BRW8LEKDlto
Source snippet
Learn to measure distance easily in the night sky: Stargazing Basics 3 of 3...
19.
Source: youtube.com
Title: Learn to measure distance easily in the night sky: Stargazing Basics 3 of 3
Link:https://www.youtube.com/watch?v=YMu5k3Ik7JU
Source snippet
Breakdown of the Pentagon UFO videos with Mick West...
20.
Source: youtube.com
Title: The SHOCKING Math Error Behind Viral UFO Videos | Mick West
Link:https://www.youtube.com/watch?v=ypfbhfEXnBo
Source snippet
A simple guide to azimuth and altitude in the horizontal coordinate system...
21.
Source: sciencedirect.com
Title: ScienceDirect Bearing Measurement
Link:https://www.sciencedirect.com/topics/engineering/bearing-measurement
Source snippet
Bearing Measurement - an overview | ScienceDirect Topics...
22.
Source: youtube.com
Title: Breakdown of the Pentagon UFO videos with Mick West
Link:https://www.youtube.com/watch?v=Le7Fqbsrrm8
Source snippet
Understanding the Azimuth and the Elevation | Photography Planning...
23.
Source: ufobc.ca
Link:https://www.ufobc.ca/yukon/22ufosize.htm
24.
Source: narcap.org
Link:https://www.narcap.org/blog/flightdynamicsofuap
25.
Source: jb.man.ac.uk
Link:https://www.jb.man.ac.uk/almanac/help.html
26.
Source: youtube.com
Title: Understanding the Azimuth and the Elevation | Photography Planning
Link:https://www.youtube.com/watch?v=JViLhPhY97o