No independent record of Lagadha survives outside the text's own attribution. Nothing about his identity, period, or historical existence can be checked against any other source, which is a gap rather than a live scholarly disagreement: no camp holds a documented rival candidate.
What would resolve this A securely dated independent reference to Lagadha in another Vedic-era or classical Indian text, or manuscript evidence tying a specific historical figure to the Vedanga Jyotisha's composition.
OpenIndology / history of Vedic literatureTranslated and critically edited by T. S. Kuppanna Sastry, The Vedanga Jyotisha of Lagadha, in its Rigveda and Yajurveda Recensions