Lord Vighnaraja is the 7th of the eight most important incarnations and one of the most popular avatars of Lord Ganesha. There are numerous names of Lord Ganesha. Lord Vighnaraja is known as the Lord of Destroyer–Remover of Evils and Obstacles. Lord Vighnaraja is also called VighnarajaVinayaka, VighnarajaVighnesa, Vigneshwara, and Vighnaharta. Sankashti means problems, obstacles, worries, troubles, hindrances, restraints or challenges. Chaturthi means the 4th day of the lunar-moon fortnight.
Sankashti Chaturthi is observed by natives and devotees as they seek and pray to Lord Ganesha to protect them, and to overcome any obstacles in life, and to bless them with intelligence, knowledge, education, success, and happiness. The 28th of September in 2018 marks a special occasion called Vighnaraja Sankashti Chaturthi.
Remembering and seeking blessings of Lord Ganesha before the start of any important or new work is considered highly auspicious, favorable and lucky. It is also to remove any obstacles to setting work. Lord Ganesha is also the Lord of Wisdom.
Often through Astrology guidance and advice, many natives worship Lord Ganesha, especially in the Ketu Dasha.
Lord Ganesha is worshiped in Hinduism, Jainism and slightly in Buddhism. Countries with complete or traces of Lord Ganesha aka the elephant God are India, Nepal, Sri Lanka, Bangladesh, Indonesia, Singapore, Thailand, Tibet, Bhutan, Japan, Guyana, Mauritius, Suriname, Trinidad-Tobago.
Like Pradosh Vrat is for Lord Shiva, Ekadashi for Lord Vishnu…Chaturthi marks the day dedicated to Lord Ganesha, i.e., the 4th day of every Hindu lunar month in the Krishna Paksha phase of the moon. Krishna Paksha is the waning-decreasing phase of the moon in the fortnight.
A Mantra for Lord Ganesha is—
Om Gan Ganapataye Namah
ॐ गं गणपतये नमः