# Yes: within the error of a course rebuilt from landmarks days later

> Still possible: The object's size, steady straight motion and rate across the sky fit a small balloon drifting on the evening's wind, and its reported…

Source: https://mysteriesdept.com/mysteries/incident-88/answers/ANS0DFY7HBAXAND/yes-within-the-error-of-a-course-rebuilt-from-landmarks-days  
Publisher: Mysteries Department  
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[Questions](https://mysteriesdept.com/questions)[Incident 88: the Hackensack disc, 3 August 1947](https://mysteriesdept.com/mysteries/incident-88)[Do the object's reported course, size and motion fit a small balloon drifting on that evening's wind?](https://mysteriesdept.com/mysteries/incident-88/questions/QST0DFY75MM5T34/do-the-objects-reported-course-size-and-motion-fit-a-small)Answer

Answer · Incident 88: the Hackensack disc, 3 August 1947

# Yes: within the error of a course rebuilt from landmarks days later

The object's size, steady straight motion and rate across the sky fit a small balloon drifting on the evening's wind, and its reported course lies within the error of a course reconstructed from street landmarks.

**Still possible** Answers **1** question0

## Where it stands

**Still possible** One piece of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- The reported course lies within about 60 degrees of the downwind direction.

## What would rule it out

- The reported course differs from the downwind direction by more than 60 degrees, or upper-air winds near 200 m blew from the north or east.

## Evidence 1 for · none against

[The reported course is 41 degrees left of downwind, and a small near balloon matches the reported size and speed](https://mysteriesdept.com/mysteries/incident-88/evidence/EVD0DFY8Y0RC6PS/the-reported-course-is-41-degrees-left-of-downwind-and-a)

Suggestive

FOR

## Tested by 1 run

| Run | Measured | Result | Against | Decision | Date |
|---|---|---|---|---|---|
| Run | course minus downwind (degrees) | -41.4 | 0 (moving exactly with the surface wind) | Within the ±60 degree band set for a landmark course; balloon not ruled out, not confirmed. | |

## The questions it answers

[Do the object's reported course, size and motion fit a small balloon drifting on that evening's wind?](https://mysteriesdept.com/mysteries/incident-88/questions/QST0DFY75MM5T34/do-the-objects-reported-course-size-and-motion-fit-a-small)

Part of [What did the three witnesses see over Hackensack on the evening of 3 August 1947?](https://mysteriesdept.com/mysteries/incident-88/questions/QST0DFY739G80E5/what-did-the-three-witnesses-see-over-hackensack-on-the)

Open2 answers, none ahead

## Cite it

```
Mysteries Department. (2026). Yes: within the error of a course rebuilt from landmarks days later [Answer ANS0DFY7HBAXAND]. https://mysteriesdept.com/r/ANS0DFY7HBAXAND
```

Key

**ANS** 0DFY7HBAXAND

Kind

Answer · hypothesis

Version

1

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