De or het horizonbepaling?

The correct Dutch article is:

de horizonbepaling

Rule Words ending in -ing: almost always de. See the rule

How to use horizonbepaling

the horizonbepalingde horizonbepaling
this horizonbepalingdeze horizonbepaling
that horizonbepalingdie horizonbepaling
our horizonbepalingonze horizonbepaling
your horizonbepalingjouw horizonbepaling
every horizonbepalingelke horizonbepaling
which horizonbepaling?welke horizonbepaling?
a big horizonbepaling / the big horizonbepalingeen grote horizonbepaling, de grote horizonbepaling