Is the javelin sector the same width as the shot put sector?

No. The javelin sector is 28.96 degrees, noticeably narrower than the 34.92 degree sector used for shot, discus, and hammer, because it is constructed from an arc rather than a circle.

What makes a throw a foul?

Landing outside the sector lines, leaving the circle or runway improperly, or fouling the front line during delivery. Any of these voids the throw regardless of how far it went.

What Is the Throwing Sector? | Track & Field AI

What Is the Throwing Sector?

Every throwing event ends the same way: an implement leaves your hand and has to land inside a marked wedge of grass or it does not count, no matter how far it flew. That wedge is the throwing sector, and its angle is not arbitrary. Shot put, discus, and hammer all share a 34.92 degree sector measured from the center of the throwing circle. The javelin uses a narrower 28.96 degree sector, because it is thrown from a curved arc rather than a circle, and the angle was chosen for a different geometric reason entirely. Both numbers are set by World Athletics rule, not by tradition or guesswork, and they apply the same way whether you are at a state meet or a world championship. Here is exactly how wide each sector is, why the numbers look so oddly specific, and what actually voids a throw.

Shot, discus, and hammer: 34.92 degrees

The sector shared by the three circle throws is 34.92 degrees, narrowed from a wider 40 degree sector in 2004 for safety as throws got longer and faster. The angle looks strange because it was chosen for how easy it is to lay out on a field: measure 10 meters from the center of the ring along each sector line and the two lines sit exactly 6 meters apart. Every certified shot, discus, and hammer sector in the world uses that same construction, from a small local meet to an Olympic final.

Javelin: 28.96 degrees, a different shape entirely

The javelin does not throw from a circle. It throws from an 8 meter radius arc at the end of a runway at least 30 meters long and 4 meters wide, so its sector lines run from the center point of that arc instead. The resulting angle, 28.96 degrees, is narrower than the circle-throw sector and was chosen for the same practical reason, so officials can construct and check it in the field without complicated math. The two numbers are close enough to confuse but different enough to matter if you are marking a field yourself.

What actually voids a throw

Landing outside either sector line is a foul regardless of distance, and a monster throw that drifts wide counts for nothing at all. The sector line itself counts as inbounds, so a mark that lands on the boundary is legal, while one that lands just past it is not. Fouling the circle or runway, like stepping over the front of the ring during a shot put attempt, also voids the throw independent of where the implement lands.

See where your release points

A throw that drifts to the sector edge is a timing problem. Film from behind, the AI shows your release direction so you keep throws safely inside the sector.

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Sources: World Athletics Rule 32 (Throws), as reflected on the shot put, discus, hammer, and javelin throw reference pages; the 2004 narrowing from 40 to 34.92 degrees is documented rule history.
Event	Sector angle	How it's constructed	Rule body
Shot put	34.92 degrees	Two lines from the center of the throwing circle, 6 m apart at 10 m out	World Athletics Rule 32
Discus	34.92 degrees	Same construction, from the center of the 2.50 m circle	World Athletics Rule 32
Hammer	34.92 degrees	Same construction, from the center of the throwing circle	World Athletics Rule 32
Javelin	28.96 degrees	Two lines from the center point of the 8 m throwing arc, not a circle	World Athletics Rule 32
Shot / discus / hammer, pre-2004	40 degrees (historical)	Narrowed to 34.92 degrees in 2004 for safety as throws got longer	World Athletics rule history
High school and college fields	Same 34.92 / 28.96 degree sectors	Fields use the same construction as the international standard; this is a field-marking spec, not a separate NFHS number	Standard construction (NFHS and NCAA competitions use World Athletics-spec sectors)

Sources: World Athletics Rule 32 (Throws), as reflected on the shot put, discus, hammer, and javelin throw reference pages; the 2004 narrowing from 40 to 34.92 degrees is documented rule history.

Event

Sector angle

How it's constructed

Rule body

Shot put

34.92 degrees

Two lines from the center of the throwing circle, 6 m apart at 10 m out

World Athletics Rule 32

Discus

34.92 degrees

Same construction, from the center of the 2.50 m circle

World Athletics Rule 32

Hammer

34.92 degrees

Same construction, from the center of the throwing circle

World Athletics Rule 32

Javelin

28.96 degrees

Two lines from the center point of the 8 m throwing arc, not a circle

World Athletics Rule 32

Shot / discus / hammer, pre-2004

40 degrees (historical)

Narrowed to 34.92 degrees in 2004 for safety as throws got longer

World Athletics rule history

High school and college fields

Same 34.92 / 28.96 degree sectors

Fields use the same construction as the international standard; this is a field-marking spec, not a separate NFHS number

Standard construction (NFHS and NCAA competitions use World Athletics-spec sectors)

What Is the Throwing Sector?

The throwing sector, explained

Shot, discus, and hammer: 34.92 degrees

Javelin: 28.96 degrees, a different shape entirely

What actually voids a throw

See where your release points

Land inside the sector lines

Sector angles by event

What Is the Throwing Sector? FAQ

The full shot put index

Keep throws in the sector.

What Is the Throwing Sector?

Shot, discus, and hammer: 34.92 degrees

Javelin: 28.96 degrees, a different shape entirely

What actually voids a throw

See where your release points

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Keep throws in the sector.